Cita APA (7th ed.)

Kiefer, W. J. (1961). Leo XIII: A light from heaven (1a. ed.). The Bruce Publishing Company.

Cita Chicago (17th ed.)

Kiefer, William J. Leo XIII: A Light from Heaven. 1a. ed. Milwaukee: The Bruce Publishing Company, 1961.

Cita MLA (9th ed.)

Kiefer, William J. Leo XIII: A Light from Heaven. 1a. ed. The Bruce Publishing Company, 1961.