Gaya APA

Swanson, C, P., Swain, R, L. (1963). Understanding arithmetic . London: London: Holt, Rinehart and Winston; 1963.

Gaya MLA

Swanson, Carl, P.., Swain, Robert, L.. "Understanding arithmetic". London: London: Holt, Rinehart and Winston; 1963, 1963. Text.