A Beginner's Further Guide to Mathematical Logic
Raymond M. Smullyan
Angels and Demons: What Do We Really Know About Them?
Peter J. Kreeft
Morphisms and Categories: Comparing and Transforming
Jean Piaget & Terrance Brown & Gil Henriques & Edgar Ascher
Faktencheck Nachhaltigkeit
Thomas Unnerstall
Aldous Huxley and the Search for Meaning
Ronald T. Sion
Critical Thinking Handbook, 6th-9th Grades: A Guide for Remodelling ...
Richard Paul