Gaya APA

Hobbs, G, M., McKinney, J. (1973). Practical mathematics : for beginners, for those who forgotten (Ed. 3). Chicago: Amerian Technical Society.

Gaya MLA

Hobbs, Glen, M.., McKinney, James. "Practical mathematics : for beginners, for those who forgotten". Ed. 3 Chicago: Amerian Technical Society, 1973. Text.