Cita APA (7a ed.)

Hartley, W. H., & Vincent, W. S. (1970). American civics (3rd ed.). Harcourt brace jovanovich.

Cita Chicago Style (17a ed.)

Hartley, William H., y William S. Vincent. American Civics. 3rd ed. New York: Harcourt brace jovanovich, 1970.

Cita MLA (9a ed.)

Hartley, William H., y William S. Vincent. American Civics. 3rd ed. Harcourt brace jovanovich, 1970.