National Council of Teachers of Mathematics, U.S.A. (1968). Números enteros. Trillas.
Tohutoru Kātū Chicago (17th ed.)National Council of Teachers of Mathematics, U.S.A. Números Enteros. Ciudad de México: Trillas, 1968.
Tohutoro MLA (9th ed.)National Council of Teachers of Mathematics, U.S.A. Números Enteros. Trillas, 1968.
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