APA (7th ed.) Citation

Hopson, J. L., & Wessells, N. K. (1990). Essentials of biology. McGraw-Hill Pub. Co..

Chicago Style (17th ed.) Citation

Hopson, Janet L., and Norman K. Wessells. Essentials of Biology. New York: McGraw-Hill Pub. Co., 1990.

MLA (9th ed.) Citation

Hopson, Janet L., and Norman K. Wessells. Essentials of Biology. McGraw-Hill Pub. Co., 1990.