APA (7th ed.) Citation

Trafton, P. R. (1989). New directions for elementary school mathematics. National Council of Teachers of Mathematics.

Chicago Style (17th ed.) Citation

Trafton, Paul R. New Directions for Elementary School Mathematics. Reston, Va.: National Council of Teachers of Mathematics, 1989.

MLA (8th ed.) Citation

Trafton, Paul R. New Directions for Elementary School Mathematics. National Council of Teachers of Mathematics, 1989.