Cita APA (7a ed.)

Semper, I. J. (1939). The battle of the books. National Organization for Decent Literature.

Cita Chicago Style (17a ed.)

Semper, Isidore Joseph. The Battle of the Books. Dubuque, Iowa: National Organization for Decent Literature, 1939.

Cita MLA (8a ed.)

Semper, Isidore Joseph. The Battle of the Books. National Organization for Decent Literature, 1939.