APA Edition Citation

Williamson, E. M., Evans, F. J., & Okpako, D. T. (1996). Selection, preparation, and pharmacological evaluation of plant material. J. Wiley.

Chicago Edition Citation

Williamson, Elizabeth M., Fred J. Evans, and D. T. Okpako. Selection, Preparation, and Pharmacological Evaluation of Plant Material. Chichester ; New York: J. Wiley, 1996.

MLA Edition Citation

Williamson, Elizabeth M., et al. Selection, Preparation, and Pharmacological Evaluation of Plant Material. J. Wiley, 1996.