Update README.md

milmana · Nov 19, 2024 · ffd06f9 · ffd06f9
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 # raytrace
 ray tracing and other graphical stuff
 
-# textbook
-[Ray Tracing in One Weekend](https://raytracing.github.io/)
+# source
+Shirley, P., Black, T. D., & Hollasch, S. (2024). Ray Tracing in One Weekend (Version 4.0.1). Retrieved from https://raytracing.github.io/books/RayTracingInOneWeekend.html