Gaya APA

Keyes, M, F. (1992). The enneagram relationship workbook: A self and partnership assessment guide. Drawings by M.K. Brown. . Muir Beach: Muir Beach Molysdatur Publications.

Gaya MLA

Keyes, Margaret, Frings. "The enneagram relationship workbook: A self and partnership assessment guide. Drawings by M.K. Brown. ". Muir Beach: Muir Beach Molysdatur Publications, 1992. Buku.