Gaya APA

Barnett, R, A., E, I, Z, M, I, B, K. (2001). Precalculus: functions and graphs . New York: .

Gaya MLA

Barnett, Raymond, A., E, I., Ziegler,, Michael, II., Byleen,, Karl. "Precalculus: functions and graphs". New York: , 2001. Text.