Die Illusion des Ich: on the taboo against knowing who you are
Alan Watts
Obsessive Compulsive Disorder and Comorbidity
Ruth Gross-Isseroff & Abraham Weizman
Character Strengths and Virtues: A Handbook and Classification
Christopher Peterson & Martin E. P. Seligman
The 12-Type Enneagram
Matthew Campling
The Multiple States of the Being
René Guénon & S. D. Fohr
Scientific Introspection
William A. Adams