APA (7th ed.) Citation

Heckenbach, A. J., & Kegley, J. C. (1970). Elementary functions: An approach to precalculus mathematics. Macmillan.

Chicago Style (17th ed.) Citation

Heckenbach, Alan J., and J. Colby Kegley. Elementary Functions: An Approach to Precalculus Mathematics. [New York]: Macmillan, 1970.

MLA (9th ed.) Citation

Heckenbach, Alan J., and J. Colby Kegley. Elementary Functions: An Approach to Precalculus Mathematics. Macmillan, 1970.