Mathematical Puzzles: And Other Brain Twisters

Current Issues and Enduring Questions: A Guide to Critical Thinking and Argument, With Readings

Water and Sky: Challenging the Northern Wilderness (Laurel Expedition)

The Rebus Book: Picture Puzzles to Tax Your Mind

Bare Your Soul: The Thinking Girl's Guide to Enlightenment (Live Girls Series)

Rethinking California: Politics and Policy in the Golden State

Discourse on Thinking

The Elements of Social Scientific Thinking

Backyard Scientist Series 3: Exciting, Challenging and Easy to Understand Experiments in the Life

Perestroika: New Thinking for Our Country and the World