Riddles of the Sphinx: And Other Mathematical Puzzle Tales
Martin Gardner
Word and Paradigm Morphology
James P. Blevins
The Best Writing on Mathematics 2013
Mircea Pitici & Roger Penrose
Knowledge and the Known: Historical Perspectives in Epistemology
Jaakko Hintikka
Philosophy, Science and Religion for Everyone
Mark Harris
Nine Lenses on the World: The Enneagram Perspective
Jerome Peter Wagner