Brownell, W. A. (1967). Arithmetical abstractions: The movement toward conceptual maturity under differing systems of instruction. University of California Press.
MLA CitationBrownell, William A. Arithmetical Abstractions: The Movement Toward Conceptual Maturity Under Differing Systems of Instruction. University of California Press, 1967.
Warning: These citations have been automatically generated and may not always be 100% accurate..