APA (7th ed.) Citation

ScienceDirect (Online service), Manske, R. H. F., & Holmes, H. L. (1950). The alkaloids. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), R. H. F. Manske, and H. L. Holmes. The Alkaloids. New York: Academic Press, 1950.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. The Alkaloids. Academic Press, 1950.