Gaya APA

Palmer, H. (1995). The enneagram in love & work: Understanding your intimate & business relationships. Foreword by David N. Daniels. . San Francisco: San Francisco HarperCollins.

Gaya MLA

Palmer, Helen. "The enneagram in love & work: Understanding your intimate & business relationships. Foreword by David N. Daniels. ". San Francisco: San Francisco HarperCollins, 1995. Buku.