Παραπομπή APA
Ogg, F. A. 1., & Ray, P. O. (1952). Essentials of American government (7th ed.). New York: Appleton-Century-Crofts.
Παραπομπή Chicago StyleOgg, Frederic Austin 1878-1951., and P. Orman Ray. Essentials of American Government. 7th ed. New York: Appleton-Century-Crofts, 1952.
Παραπομπή MLAOgg, Frederic Austin 1878-1951., and P. Orman Ray. Essentials of American Government. 7th ed. New York: Appleton-Century-Crofts, 1952.
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