APA (7th ed.) Citation

ScienceDirect (Online service), Henry, H. L., & Norman, A. W. (2003). Encyclopedia of hormones. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Helen L. Henry, and A. W. Norman. Encyclopedia of Hormones. Amsterdam ; Boston: Academic Press, 2003.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Encyclopedia of Hormones. Academic Press, 2003.