diff --git a/src/sparqlunicorn_ontdoc/export/pages/bibpage.py b/src/sparqlunicorn_ontdoc/export/pages/bibpage.py
index bf2e66b1..ed5005b8 100644
--- a/src/sparqlunicorn_ontdoc/export/pages/bibpage.py
+++ b/src/sparqlunicorn_ontdoc/export/pages/bibpage.py
@@ -11,7 +11,7 @@ def collectionConstraint(self):
         return ["http://purl.org/ontology/bibo/Collection"]
 
     @staticmethod
-    def resolveBibtexReference(self, predobjs, item, graph):
+    def resolveBibtexReference(predobjs, item, graph):
         bibtexmappings = {"http://purl.org/dc/elements/1.1/title": "title",
                           "http://purl.org/dc/terms/title": "title",
                           "http://purl.org/dc/terms/created": "year",