Gaya APA

Grossnickle, F, E., John, I, R. (NULL). Discovering meanings in elementary school mathematics . New: New York: Holt, Rinehart and Winston; 1968..

Gaya MLA

Grossnickle, Foster, E.., John, I., Reckzeh,. "Discovering meanings in elementary school mathematics". New: New York: Holt, Rinehart and Winston; 1968., NULL. Text.