City Lights (1931)
https://www.rogerebert.com/reviews/great-movie-city-lights-1931
Roger Ebert's review of the film.
City Lights
http://www.tcm.com/tcmdb/title/324720/City-Lights/articles.html
An analysis of the film on the website for Turner Classic Movies.
Charlie Chaplin and Buster Keaton: A Crash Course
https://ew.com/article/2002/01/11/charlie-chaplin-and-buster-keaton-crash-course/
An article analyzing and comparing the two most famous silent film comedians: Charlie Chaplin and Buster Keaton.
Charlie Chaplin Interview clip 1957
https://www.youtube.com/watch?v=7j5v0mRFr8U
A video of an interview with Charlie Chaplin.