Gaya APA

Swanson, C, P., Christy, D, T. (1981). Essentials of precalculus mathematics . New York: New York: Harper & Row; 1981..

Gaya MLA

Swanson, Carl, P.., Christy, Dennis, T.. "Essentials of precalculus mathematics". New York: New York: Harper & Row; 1981., 1981. Text.