The International Thesaurus of Quotations: Revised Editon
Eugene Ehrlich & Marshall DeBruhl
Philosophy: A Guide Through the Subject
A. C. Grayling
Maps of Meaning: The Architecture of Belief
Jordan B. Peterson
Computeralgebra: Eine algorithmisch orientierte Einführung
Wolfram Koepf
Toward Awakening An Approach to the Teaching Brought by Gurdjieff
Jean Vaysse
Generalized Riemann Integral
Robert M. McLeod