APA (7th ed.) Citation

Charles, R., Lester, F. K., & O'Daffer, P. G. (1987). How to evaluate progress in problem solving. National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Charles, Randall, Frank K. Lester, and Phares G. O'Daffer. How to Evaluate Progress in Problem Solving. Reston, Va.: National Council of Teachers of Mathematics, 1987.

MLA (9th ed.) Citation

Charles, Randall, et al. How to Evaluate Progress in Problem Solving. National Council of Teachers of Mathematics, 1987.