On vision and colors by Arthur Schopenhauer and Color sphere ...
Arthur Schopenhauer & Philipp Otto Runge & Georg Stahl
Money: Understanding and Creating Alternatives to Legal Tender
Thomas H. Greco, Jr.
Beyond the Pleasure Principle and Other Writings
Sigmund Freud
The Logical Structure of the World and Pseudoproblems in Philosophy
Rudolf Carnap
The Politics of the Family
R. D. Laing