Gaya APA

Barnett, R, A., Ziegler, M, R. (1993). Precalculus : fuctions and graphs (3rd ed). New York: McGraw Hill.

Gaya MLA

Barnett, Raymond, A.., Ziegler, Michael, R.. "Precalculus : fuctions and graphs". 3rd ed New York: McGraw Hill, 1993. Text.