APA (7th ed.) Citation

ScienceDirect (Online service), Harris, K. F., & Maramorosch, K. (1977). Aphids as virus vectors. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Kerry F. Harris, and Karl Maramorosch. Aphids as Virus Vectors. New York: Academic Press, 1977.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Aphids as Virus Vectors. Academic Press, 1977.