Gaya APA

Schmidt-Erfurth, U., Kohnen, T. (2018). Encyclopedia of Ophthalmology (1st ed. 2018). New york: Springer International Publishing.

Gaya MLA

Schmidt-Erfurth, Ursula., Kohnen, Thomas. "Encyclopedia of Ophthalmology". 1st ed. 2018 New york: Springer International Publishing, 2018. Text.