Gaya APA

Groeschel, B, J. (1987). Stumbling blocks or stepping stones: Spiritual answers to psychological questions. . New York dsl: New York dsl Paulist Press.

Gaya MLA

Groeschel, Benedict, J.. "Stumbling blocks or stepping stones: Spiritual answers to psychological questions. ". New York dsl: New York dsl Paulist Press, 1987. Buku.