Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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