John Dos Passos, Witness To Our Times
http://www.csupomona.edu/~rljohnson/Professional/DosPassos.html
A paper on Dos Passos by Richard Johnson, Chautauqua Scholar, Dos Passos Interpreter, and Professor of American History, California State Polytechnic University, Pomona. Particularly illuminating in tracing the writer's shift "from radical to reactionary."
John Dos Passos per Daniel Aaron
http://www.writing.upenn.edu/~afilreis/50s/aaron-chap15.html
A chapter from Daniel Aaron's Writers on the Left focusing on Dos Passos's early career as a leftist writer.
American Web Resouces: John Dos Passos
http://www.millikin.edu/aci/crow/chronology/dospassosbio.html
A convenient chronology and bibliography.
Today in Literature: John Dos Passos - Life Stories, Books, and Links
http://www.todayinliterature.com/biography/john.dos.passos.asp
A comprehensive site, including numerous links to important texts on Dos Passos and his work.