Problem-solving
I like "The Art and Craft of Problem Solving" by Paul Zeitz
Problem-Solving Strategies
Arthur Engel
http://www.amazon.com/Problem-Solving-Strategies-Problem-Books-Mathematics/dp/0387982191
I like "The Art and Craft of Problem Solving" by Paul Zeitz
Problem-Solving Strategies
Arthur Engel
http://www.amazon.com/Problem-Solving-Strategies-Problem-Books-Mathematics/dp/0387982191