APA (7th ed.) Citation

Whimbey, A., & Lochhead, J. (1999). Problem solving and comprehension (6th ed.). Lawrence Erlbaum Associates.

Chicago Style (17th ed.) Citation

Whimbey, Arthur, and Jack Lochhead. Problem Solving and Comprehension. 6th ed. Mahwah, N.J.: Lawrence Erlbaum Associates, 1999.

MLA (9th ed.) Citation

Whimbey, Arthur, and Jack Lochhead. Problem Solving and Comprehension. 6th ed. Lawrence Erlbaum Associates, 1999.