If you like Ennea-type structures

Claudio Naranjo

Here’s what to read next

The enneagram

Helen Palmer

Understanding the enneagram

Don Richard Riso

Discovering the enneagram

Richard Rohr

The 7 Habits of Highly Effective People

Stephen R. Covey

Personality Types

Don Richard Riso

Personality psychology

Randy J. Larsen

Reading people

Jo-Ellan Dimitrius

The Road back to you

Ian Morgan Cron

The Road Back to You Study Guide

Ian Morgan Cron

The 16 Sixteen Personality Types

Linda V. Berens

Interpersonal Diagnosis of Personality

Timothy Leary

LIFETypes

Sandra Krebs Hirsh

The Secret Language of Birthdays

Gary Goldschneider

Games People Play

Eric Berne

Quiet

Susan Cain