APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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