APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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