Gaya APA

Swanson, C, P., Bell, F, H. (1978). Teaching learning mathematics in secondary schools . Iowa: Iowa: Wm. C. Brown; 1978.

Gaya MLA

Swanson, Carl, P.., Bell, Frederick, H. "Teaching learning mathematics in secondary schools". Iowa: Iowa: Wm. C. Brown; 1978, 1978. Text.