Cita APA (7th ed.)

Bohner, C. (1981). Robert Penn Warren (2a. ed.). Twayne Publishers.

Cita Chicago (17th ed.)

Bohner, Charles. Robert Penn Warren. 2a. ed. Boston: Twayne Publishers, 1981.

Cita MLA (9th ed.)

Bohner, Charles. Robert Penn Warren. 2a. ed. Twayne Publishers, 1981.