Dyfyniad APA
Barnett, R. A., Ziegler, M. R., & Byleen, K. E. (1999). Precalculus: Functions and graphs (4th ed.). WCB/McGraw-Hill.
Dyfyniad Arddull Chicago
Barnett, Raymond A., Michael R. Ziegler, and Karl E. Byleen. Precalculus: Functions and Graphs. 4th ed. Boston: WCB/McGraw-Hill, 1999.
Dyfyniad MLA
Barnett, Raymond A., et al. Precalculus: Functions and Graphs. 4th ed. WCB/McGraw-Hill, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.