diff --git a/sources/asana_dlt/__init__.py b/sources/asana_dlt/__init__.py
index ebf9d10a6..23bc2dba3 100644
--- a/sources/asana_dlt/__init__.py
+++ b/sources/asana_dlt/__init__.py
@@ -7,10 +7,11 @@
 """
 
 import typing as t
-from typing import Any, Iterable
+from typing import Any, Iterable, Sequence
 
 import dlt
 from dlt.common.typing import TDataItem
+from dlt.extract.resource import DltResource
 
 from .helpers import get_client
 from .settings import (
@@ -28,7 +29,7 @@
 
 
 @dlt.source
-def asana_source() -> Any:  # should be Sequence[DltResource]:
+def asana_source(access_token: str = dlt.secrets.value) -> Sequence[DltResource]:
     """
     The main function that runs all the other functions to fetch data from Asana.
     Returns:
diff --git a/sources/bing_webmaster/__init__.py b/sources/bing_webmaster/__init__.py
index 8025e6fba..540583807 100644
--- a/sources/bing_webmaster/__init__.py
+++ b/sources/bing_webmaster/__init__.py
@@ -6,11 +6,11 @@
 """
 
 import time
-from typing import Iterable, Iterator, List, Sequence
+from typing import Dict, Iterator, List, Sequence
 
 import dlt
 from dlt.common import logger
-from dlt.common.typing import DictStrAny, DictStrStr
+from dlt.common.typing import DictStrAny
 from dlt.sources import DltResource
 
 from .helpers import get_stats_with_retry, parse_response
@@ -18,14 +18,15 @@
 
 @dlt.source(name="bing_webmaster")
 def source(
-    site_urls: List[str] = None, site_url_pages: Iterable[DictStrStr] = None
+    site_urls: List[str] = dlt.config.value,
+    site_url_pages: List[Dict[str, str]] = dlt.config.value,
 ) -> Sequence[DltResource]:
     """
     A dlt source for the Bing Webmaster api.
     It groups resources for the APIs which return organic search traffic statistics
     Args:
         site_urls: List[str]: A list of site_urls, e.g, ["dlthub.com", "dlthub.de"]. Use this if you need the weekly traffic per site_url and page
-        site_url_pages: Iterable[DictStrStr]: A list of pairs of site_url and page. Use this if you need the weekly traffic per site_url, page, and query
+        site_url_pages: Iterable[Dict[str, str]]: A list of pairs of site_url and page. Use this if you need the weekly traffic per site_url, page, and query
     Returns:
         Sequence[DltResource]: A sequence of resources that can be selected from including page_stats and page_query_stats.
     """
@@ -70,7 +71,7 @@ def page_stats(
     table_name="bing_page_query_stats",
 )
 def page_query_stats(
-    site_url_pages: Iterable[DictStrStr],
+    site_url_pages: List[Dict[str, str]],
     api_key: str = dlt.secrets.value,
 ) -> Iterator[Iterator[DictStrAny]]:
     """
@@ -80,7 +81,7 @@ def page_query_stats(
     https://learn.microsoft.com/en-us/dotnet/api/microsoft.bing.webmaster.api.interfaces.iwebmasterapi.getpagequerystats
 
     Args:
-        site_url_page (Iterable[DictStrStr]): Iterable of site_url and pages to retrieve statistics for. Can be result of a SQL query, a parsed sitemap, etc.
+        site_url_page (List[Dict[str,str]]): Iterable of site_url and pages to retrieve statistics for. Can be result of a SQL query, a parsed sitemap, etc.
     Yields:
         Iterator[Dict[str, Any]]: An iterator over list of organic traffic statistics.
     """
diff --git a/sources/chess/__init__.py b/sources/chess/__init__.py
index 3915abe5c..f0004f053 100644
--- a/sources/chess/__init__.py
+++ b/sources/chess/__init__.py
@@ -14,7 +14,9 @@
 
 @dlt.source(name="chess")
 def source(
-    players: List[str], start_month: str = None, end_month: str = None
+    players: List[str] = dlt.config.value,
+    start_month: str = None,
+    end_month: str = None,
 ) -> Sequence[DltResource]:
     """
     A dlt source for the chess.com api. It groups several resources (in this case chess.com API endpoints) containing
diff --git a/sources/github/__init__.py b/sources/github/__init__.py
index 4a1834528..459d3cc4d 100644
--- a/sources/github/__init__.py
+++ b/sources/github/__init__.py
@@ -12,8 +12,8 @@
 
 @dlt.source
 def github_reactions(
-    owner: str,
-    name: str,
+    owner: str = dlt.config.value,
+    name: str = dlt.config.value,
     access_token: str = dlt.secrets.value,
     items_per_page: int = 100,
     max_items: Optional[int] = None,
diff --git a/sources/hubspot/__init__.py b/sources/hubspot/__init__.py
index 1edbc1591..16cdac90c 100644
--- a/sources/hubspot/__init__.py
+++ b/sources/hubspot/__init__.py
@@ -477,8 +477,8 @@ def fetch_props(
 
 @dlt.resource
 def hubspot_events_for_objects(
-    object_type: THubspotObjectType,
-    object_ids: List[str],
+    object_type: THubspotObjectType = dlt.config.value,
+    object_ids: List[str] = dlt.config.value,
     api_key: str = dlt.secrets.value,
     start_date: pendulum.DateTime = STARTDATE,
 ) -> DltResource:
diff --git a/sources/kafka/__init__.py b/sources/kafka/__init__.py
index 846b35621..5036fd20e 100644
--- a/sources/kafka/__init__.py
+++ b/sources/kafka/__init__.py
@@ -27,7 +27,7 @@
     standalone=True,
 )
 def kafka_consumer(
-    topics: Union[str, List[str]],
+    topics: List[str] = dlt.config.value,
     credentials: Union[KafkaCredentials, Consumer] = dlt.secrets.value,
     msg_processor: Optional[
         Callable[[Message], Dict[str, Any]]
@@ -60,9 +60,6 @@ def kafka_consumer(
     Yields:
         Iterable[TDataItem]: Kafka messages.
     """
-    if not isinstance(topics, list):
-        topics = [topics]
-
     if isinstance(credentials, Consumer):
         consumer = credentials
     elif isinstance(credentials, KafkaCredentials):
diff --git a/sources/kafka_pipeline.py b/sources/kafka_pipeline.py
index af9476cad..0dc08b304 100644
--- a/sources/kafka_pipeline.py
+++ b/sources/kafka_pipeline.py
@@ -47,7 +47,7 @@ def custom_msg_processor(msg: confluent_kafka.Message) -> Dict[str, Any]:
             "data": msg.value().decode("utf-8"),
         }
 
-    data = kafka_consumer("books", msg_processor=custom_msg_processor)
+    data = kafka_consumer(["books"], msg_processor=custom_msg_processor)
 
     info = pipeline.run(data)
     print(info)
@@ -63,7 +63,7 @@ def load_starting_from_date() -> None:
     )
 
     from_date = datetime(2023, 12, 15)
-    data = kafka_consumer("books", start_from=from_date)
+    data = kafka_consumer(["books"], start_from=from_date)
 
     info = pipeline.run(data)
     print(info)
diff --git a/sources/pipedrive/__init__.py b/sources/pipedrive/__init__.py
index 4e9bb3001..1d54fb9a5 100644
--- a/sources/pipedrive/__init__.py
+++ b/sources/pipedrive/__init__.py
@@ -174,7 +174,7 @@ def parsed_mapping(
 
 
 @dlt.resource(primary_key="id", write_disposition="merge")
-def  leads(
+def leads(
     pipedrive_api_key: str = dlt.secrets.value,
     update_time: dlt.sources.incremental[str] = dlt.sources.incremental(
         "update_time", "1970-01-01 00:00:00"