Friedman, Lawrence S., The Cinema of Martin Scorsese. Oxford, UK: Roundhouse Publishing Ltd., 1997.
Gilbey, Ryan. It Don't Worry Me: Nashville, Jaws, Star Wars and Beyond. London: Faber and Faber Ltd., 2003.
Kolker, Robert Phillip. A Cinema of Loneliness: Penn, Kubrick, Scorsese, Spielberg, Altman. Pleasantville, New York: Redgrave, 1980.
Lev, Peter. American Films of the 70s: Conflicting Visions. Austin, University of Texas Press: 2000.
Scorsese, Martin. Scorsese on Scorsese. Ed. David Thompson and Ian Christie. Boston: Faber and Faber, 1989.
Stern, Leslie. The Scorsese Connection. Bloomington, IN: Indiana University Press, 1995.
Von Gunden, Kenneth. Postmodern Auteurs: Coppola, Lucas, De Palma, Spielberg and Scorsese. Jefferson, North Carolina: McFarland & Company, Inc, 1991.
Also you should note that "Diary of a Country Priest"(1951) by Robert Bresson had a considerable influence on the film.
The character Travis Bickle drives a taxi around and complains about all the pimps,pushers,perverts,skunkpussies,prostitutes and lowlifes that trash the streets of the city. He imagines that it needs cleaned up by him being the hero. Then he meets a young prostitute thats like 12 year old (played by Jodi Foster in movie) He don't have sex with her but just talks to her. He feels the street hustler he met earlier is holding a threat over her forcing the minor into prostitution. So he buys two guns an goes into rundown apartment building shoot... Read more→
1 out of 2 people found this helpful