Goldstein, L. J., & Lay, D. I. (1987). Brief calculus and its applications (4th ed.). Prentice hall.

Goldstein, Larry J., and David I. Lay. Brief Calculus and Its Applications. 4th ed. New Jersey: Prentice hall, 1987.

Goldstein, Larry J., and David I. Lay. Brief Calculus and Its Applications. 4th ed. Prentice hall, 1987.