Fehr, H. F. (1967). Teaching modern mathematics in the elementary school. Addison-Wesley.
Chicago Style (17. basım) AtıfFehr, Howard F. Teaching Modern Mathematics in the Elementary School. Reading, Mass: Addison-Wesley, 1967.
MLA (9th ed.) AtıfFehr, Howard F. Teaching Modern Mathematics in the Elementary School. Addison-Wesley, 1967.
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