Gaya APA

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

Gaya MLA

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