Ogg, F. A. 1., & Ray, P. O. (1951). Introduction to American government (10th ed.). Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Ogg, Frederick Austin 1878, agus Perley Orman Ray. Introduction to American Government. 10th ed. New York: Appleton-Century-Crofts, 1951.
Lua MLA (9ú heag.)Ogg, Frederick Austin 1878, agus Perley Orman Ray. Introduction to American Government. 10th ed. Appleton-Century-Crofts, 1951.
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