APA (7th ed.) Citation

ScienceDirect (Online service), Hamdoun, A., & Foltz, K. R. (2019). Echinoderms. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Amro Hamdoun, and Kathy R. Foltz. Echinoderms. [Place of publication not identified]: Academic Press, 2019.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Echinoderms. Academic Press, 2019.