Cita APA (7a ed.)

Passelecq, G., Suchecky, B., & Wills, G. (1997). The hidden encyclical of Pius XI. Harcourt Brace & Company.

Cita Chicago Style (17a ed.)

Passelecq, Georges, Bernard Suchecky, y Garry Wills. The Hidden Encyclical of Pius XI. New York [etc.]: Harcourt Brace & Company, 1997.

Cita MLA (9a ed.)

Passelecq, Georges, et al. The Hidden Encyclical of Pius XI. Harcourt Brace & Company, 1997.