Hiebert, J., & Behr, M. J. (1988). Number concepts and operations in the middle grades. Lawrence Erlbaum, National Council of Teachers of Mathematics.
Chicago Style (17th ed.) CitationHiebert, James, and Merlyn J. Behr. Number Concepts and Operations in the Middle Grades. Virginia: Lawrence Erlbaum, National Council of Teachers of Mathematics, 1988.
MLA (9th ed.) CitationHiebert, James, and Merlyn J. Behr. Number Concepts and Operations in the Middle Grades. Lawrence Erlbaum, National Council of Teachers of Mathematics, 1988.
Warning: These citations may not always be 100% accurate.