Berger, E. J., & Johnson, D. (1966). A guide to the use and procurement of teaching aids for mathematics. National Council of Teachers of Mathematics.
Chicago Style (17th ed.) CitationBerger, Emil J., and D. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. Washington, DC: National Council of Teachers of Mathematics, 1966.
MLA (9th ed.) CitationBerger, Emil J., and D. Johnson. A Guide to the Use and Procurement of Teaching Aids for Mathematics. National Council of Teachers of Mathematics, 1966.
Warning: These citations may not always be 100% accurate.