Gaya APA

Rohr, R, &, E, A. (1990). Discovering the Enneagram: An ancient tool for a new spiritual journey. Transl. by Peter Heinegg. : Das Enneagram: Die 9 Gesichter der Seele. 1989 . New York: New York Crossroad.

Gaya MLA

Rohr, Richard, &, Ebert,, Andreas. "Discovering the Enneagram: An ancient tool for a new spiritual journey. Transl. by Peter Heinegg. : Das Enneagram: Die 9 Gesichter der Seele. 1989 ". New York: New York Crossroad, 1990. Buku.