TransliterationChekmarov Ya., Snіgіrov V. Metodika vikladannya arifmetiki. Posіbnik dlya pedagogіchnih uchilishh. 1951. In Russian
In EnglishChekmarov Ya., Snіgіrov V. Metodika vikladannya arifmetiki. Posіbnik dlya pedagogіchnih uchilishh. 1951. In Russian
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