Cita APA (7a ed.)

Spilka, B., & Ladd, K. L. (2012). The psychology of prayer: A scientific approach. Guilford Press.

Cita Chicago Style (17a ed.)

Spilka, Bernard, y Kevin L. Ladd. The Psychology of Prayer: A Scientific Approach. New York: Guilford Press, 2012.

Cita MLA (9a ed.)

Spilka, Bernard, y Kevin L. Ladd. The Psychology of Prayer: A Scientific Approach. Guilford Press, 2012.