Add missing reference for Python "inner classes"

documents/references.md

@@ -8,6 +8,17 @@ All references to external logic. Includes anything from stack overflow links to
 ## New References
 References new to this project.
 
+### Nested Classes
+I felt like the 3 "functions" from our book Algorithm seemed complicated enough to each be separate entities on their
+own. Rather than trying to cram all the logic into one large class, I decided to look into splitting each function into
+it's own class in an attempt to compartmentalize logic.
+
+Inspiration came from how Django handles "model query managers" with the "models.objects.<query>" syntax.
+
+References for how nested classes work are:
+* <https://stackoverflow.com/questions/719705/what-is-the-purpose-of-pythons-inner-classes>
+* <https://www.datacamp.com/community/tutorials/inner-classes-python>
+
 ### Class __call__ Function
 Used to call a class instance as if it were a function.
 * <https://stackoverflow.com/questions/9663562/what-is-the-difference-between-init-and-call>