Dyfyniad APA
Purcell, E. J., & Varberg, D. (1984). Calculus: With analytical geometry (4th ed.). Prentice-Hall.
Dyfyniad Arddull Chicago
Purcell, Edwin J., and Dale Varberg. Calculus: With Analytical Geometry. 4th ed. New Jersey: Prentice-Hall, 1984.
Dyfyniad MLA
Purcell, Edwin J., and Dale Varberg. Calculus: With Analytical Geometry. 4th ed. Prentice-Hall, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.