APA (7th ed.) Citation

ScienceDirect (Online service), Baker, J. R., Muller, R., Rollinson, D., & Tzipori, S. (1998). Opportunistic protozoa in humans. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), John R. Baker, Ralph Muller, D. Rollinson, and Saul Tzipori. Opportunistic Protozoa in Humans. San Diego: Academic Press, 1998.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Opportunistic Protozoa in Humans. Academic Press, 1998.