Cita APA (7a ed.)

Parke, S. (2008). The enneagram: A private session with the world's greatest psychologist. Lion.

Cita Chicago Style (17a ed.)

Parke, Simon. The Enneagram: A Private Session with the World's Greatest Psychologist. Oxford: Lion, 2008.

Cita MLA (9a ed.)

Parke, Simon. The Enneagram: A Private Session with the World's Greatest Psychologist. Lion, 2008.