APA (7th ed.) Citation

ScienceDirect (Online service), Brossi, A., & Suffness, M. (1990). The alkaloids. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Arnold Brossi, and Matthew Suffness. The Alkaloids. San Diego ; London: Academic Press, 1990.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. The Alkaloids. Academic Press, 1990.