Critical Thinking
Richard L. Epstein & Carolyn Kernberger
Topology Problem Solver
Research & Education Association & Emil G. Milewski
Yearbook of Morphology 1999
Geert Booij & Jaap Marle
Social philosophy
By Gerald F. Gaus
Angels and Demons: What Do We Really Know About Them?
Peter J. Kreeft
Fever Pitch
Nick Hornby