Citazione Stile APA (7a Edizione)

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.

Citazione stile Chigago Style (17a edizione)

Charles, Randall I., Frank K. Lester, e 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.

Citatione MLA (9a 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.