APA (7th ed.) Citation

ScienceDirect (Online service) & Ryan, S. J. (2013). Retina (5th ed.). Saunders.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service) and Stephen J. Ryan. Retina. 5th ed. [London?]: Saunders, 2013.

MLA (9th ed.) Citation

ScienceDirect (Online service) and Stephen J. Ryan. Retina. 5th ed. Saunders, 2013.

Warning: These citations may not always be 100% accurate.