Palmer, Helen. The enneagram : understanding yourself and the others in your life / Helen Palmer. - [San Francisco] : HarperSanFrancisco, 1991. - xv, 392 p. : ill. ; 21 cm. - 155.2/64 . Includes bibliographical references (p. [389]-392). ISBN: 0062506838 (alk. paper) Subjects--Topical Terms: Enneagram. Dewey Class. No.: 155.2/64