Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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