The Complete Enneagram: 27 Paths to Greater Self-Knowledge
Beatrice Chestnut
Topics in Universal Algebra
Bjarni Jonsson
The Linear Algebra Survival Guide: Illustrated with Mathematica®
Fred Szabo
Introduction to Boolean Algebras
Steven Givant & Paul Halmos
Body Types: The Enneagram of Essence Types
Joel Friedlander
Rules of the Game
Neil Strauss
Cultural Encyclopedia of the Penis
Michael Kimmel & Christine Milrod & Amanda Kennedy
Fire in the Belly: On Being a Man
Sam Keen