APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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