Cita APA (7a ed.)

Royce, J., Smith, J. E., & Oppenheim, F. M. (2001). The problem of Christianity. The Catholic University of America Press.

Cita Chicago Style (17a ed.)

Royce, Josiah, John E. Smith, y Frank M. Oppenheim. The Problem of Christianity. Washington D.C.: The Catholic University of America Press, 2001.

Cita MLA (9a ed.)

Royce, Josiah, et al. The Problem of Christianity. The Catholic University of America Press, 2001.