Berger, E. J., & Johnson, D. A. (1959). A Guide to the use and procurement of teaching aids for mathematics. Washington: National Council of Teachers of Mathematics.
Chicago Style CitationBerger, Emil J., and Donovan A. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. Washington: National Council of Teachers of Mathematics, 1959.
MLA CitationBerger, Emil J., and Donovan A. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. Washington: National Council of Teachers of Mathematics, 1959.
Warning: These citations may not always be 100% accurate.