APA (7th ed.) Citation

Reys, B. (1999). Elementary school mathematics: What parents should know about problem solving (2nd ed.). National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Reys, Barbara. Elementary School Mathematics: What Parents Should Know About Problem Solving. 2nd ed. Reston, Va.: National Council of Teachers of Mathematics, 1999.

MLA (9th ed.) Citation

Reys, Barbara. Elementary School Mathematics: What Parents Should Know About Problem Solving. 2nd ed. National Council of Teachers of Mathematics, 1999.