APA (7th ed.) Citation

Herr, T., & Johnson, K. (1994). Problem solving strategies: Teacher's resource book and answer key. Key Curriculum Press.

Chicago Style (17th ed.) Citation

Herr, Ted, and Ken Johnson. Problem Solving Strategies: Teacher's Resource Book and Answer Key. Berkeley, Calif: Key Curriculum Press, 1994.

MLA (9th ed.) Citation

Herr, Ted, and Ken Johnson. Problem Solving Strategies: Teacher's Resource Book and Answer Key. Key Curriculum Press, 1994.