Gaya APA

American principles and issues. (1961). New York: Holt Rinehart and Winston.

Gaya Chicago

American principles and issues. . New York: Holt Rinehart and Winston, 1961. Tesis.

Gaya MLA

American principles and issues. . New York: Holt Rinehart and Winston, 1961. Tesis.

Gaya Turabian

American principles and issues. New York: Holt Rinehart and Winston, 1961. Tesis.