Citazione Stile APA (7a Edizione)

Ferguson, J. H., & McHenry, D. E. (1961). The American system of government (6th ed.). McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Ferguson, John Henry, e Dean E. McHenry. The American System of Government. 6th ed. New York: McGraw-Hill, 1961.

Citatione MLA (9a ed.)

Ferguson, John Henry, e Dean E. McHenry. The American System of Government. 6th ed. McGraw-Hill, 1961.