Heimer, R. T., & Trueblood, C. R. (1977). Strategies for teaching children mathematics. Addison-Wesley Pub. Co..
Čikaški stil citiranja (17. izdanje)Heimer, Ralph T., i Cecil R. Trueblood. Strategies for Teaching Children Mathematics. Reading, Mass.: Addison-Wesley Pub. Co., 1977.
MLA način citiranja (8. izdanje)Heimer, Ralph T., i Cecil R. Trueblood. Strategies for Teaching Children Mathematics. Addison-Wesley Pub. Co., 1977.
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