Gaya APA

Groeschel, B, J. (1988). Spiritual passages: The psychology of spiritual development. 'For those who seek'. . New York: New York Crossroad.

Gaya MLA

Groeschel, Benedict, J.. "Spiritual passages: The psychology of spiritual development. 'For those who seek'. ". New York: New York Crossroad, 1988. Buku.