Cita APA (7th ed.)
Varberg, D. E., & Purcell, E. J. (1992). Calculus with analytic geometry (6th ed.). Prentice Hall.
Cita Chicago (17th ed.)
Varberg, Dale E., i Edwin J. Purcell. Calculus with Analytic Geometry. 6th ed. Englewood Cliffs, N.J.: Prentice Hall, 1992.
Cita MLA (9th ed.)
Varberg, Dale E., i Edwin J. Purcell. Calculus with Analytic Geometry. 6th ed. Prentice Hall, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.