APA (7th ed.) Zitazioa

Ferguson, J. H., & McHenry, D. E. (1956). The american system of government (4a. ed.). McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Ferguson, John H., eta Dean E. McHenry. The American System of Government. 4a. ed. Nueva York: McGraw-Hill, 1956.

MLA (9th ed.) Zitazioa

Ferguson, John H., eta Dean E. McHenry. The American System of Government. 4a. ed. McGraw-Hill, 1956.