Cita APA (7a ed.)

Ruud, W. L., & Shell, T. L. (1993). Prelude to calculus (2nd ed.). PWS-Kent Pub. Co.

Cita Chicago Style (17a ed.)

Ruud, Warren L., y Terry L. Shell. Prelude to Calculus. 2nd ed. Boston: PWS-Kent Pub. Co, 1993.

Cita MLA (9a ed.)

Ruud, Warren L., y Terry L. Shell. Prelude to Calculus. 2nd ed. PWS-Kent Pub. Co, 1993.