Cita APA (7th ed.)

Charles, R. I., Lester, F. K., & O'Deffer, P. G. (1987). How to evaluate progress in problem solving: R. I. Charles, Frank Loster, Phares O'Deffer. National Council of Teachers of Math.

Cita Chicago (17th ed.)

Charles, Randall I., Frank K. Lester, i Phares G. O'Deffer. How to Evaluate Progress in Problem Solving: R. I. Charles, Frank Loster, Phares O'Deffer. Reston, Virginia: National Council of Teachers of Math, 1987.

Cita MLA (9th ed.)

Charles, Randall I., et al. How to Evaluate Progress in Problem Solving: R. I. Charles, Frank Loster, Phares O'Deffer. National Council of Teachers of Math, 1987.