Gaya APA

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

Gaya MLA

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