Casper, L. (1960). Robert Penn Warren: The Dark and Bloody Ground. University of Washington Press.
Cita Chicago Style (17a ed.)Casper, Leonard. Robert Penn Warren: The Dark and Bloody Ground. Seattle: University of Washington Press, 1960.
Cita MLA (9a ed.)Casper, Leonard. Robert Penn Warren: The Dark and Bloody Ground. University of Washington Press, 1960.
Precaución: Estas citas no son 100% exactas.