Kaplan, J. (1974). Lincoln Steffens: A biography / Justin Kaplan. Simon and Schuster.
Lua i Stíl Chicago (17ú heag.)Kaplan, Justin. Lincoln Steffens: A Biography / Justin Kaplan. New York: Simon and Schuster, 1974.
Lua MLA (8ú heag.)Kaplan, Justin. Lincoln Steffens: A Biography / Justin Kaplan. Simon and Schuster, 1974.
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