Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.