Cita APA

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

Citación estilo Chicago

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

Cita MLA

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