National Council of Teachers of Mathematics, Shulte, A. P., & Trafton, P. R. (1989). New directions for elementary school mathematics: 1989 yearbook. National Council of Teachers of Mathematics.
Chicago Style (17th ed.) CitationNational Council of Teachers of Mathematics, Albert P. Shulte, and Paul R. Trafton. New Directions for Elementary School Mathematics: 1989 Yearbook. Reston, Va.: National Council of Teachers of Mathematics, 1989.
MLA (9th ed.) CitationNational Council of Teachers of Mathematics, et al. New Directions for Elementary School Mathematics: 1989 Yearbook. National Council of Teachers of Mathematics, 1989.
Warning: These citations may not always be 100% accurate.