Gaya APA

Brueckner, L, J., E, I, G, F. (NULL). Developing mathematical understandings in the upper grades . New: New York: Holt, Rinehart and Winston; 1957.

Gaya MLA

Brueckner, Leo, J., E, I., Grossnickle,, Foster. "Developing mathematical understandings in the upper grades". New: New York: Holt, Rinehart and Winston; 1957, NULL. Text.