APA (7th ed.) Citation

Hunter, A., Barras, C., & Thuy, B. (2011). Online field guide to British Middle Jurassic echinoderms.

Chicago Style (17th ed.) Citation

Hunter, Aaron, C. Barras, and B. Thuy. Online Field Guide to British Middle Jurassic Echinoderms. 2011.

MLA (9th ed.) Citation

Hunter, Aaron, et al. Online Field Guide to British Middle Jurassic Echinoderms. 2011.