Gaya APA
Vaughan, D. et al (1989).
General ophthalmology, 12th Edition (12th. Ed).
United States of America:
Appleton & Lange.
Gaya MLA
Vaughan, Daniel. et al.
"General ophthalmology, 12th Edition".
12th. Ed
United States of America:
Appleton & Lange,
1989.
Text.