Lua APA (7ú heag.)

KRAMER, K. (1978). Teaching elementary school mathematics.-- Ed.4. Allyn and Bacon.

Lua i Stíl Chicago (17ú heag.)

KRAMER, Klaas. Teaching Elementary School Mathematics.-- Ed.4. Boston: Allyn and Bacon, 1978.

Lua MLA (9ú heag.)

KRAMER, Klaas. Teaching Elementary School Mathematics.-- Ed.4. Allyn and Bacon, 1978.

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