Citação norma APA

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

Citação norma Chicago

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

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.