Gaya APA
Kohnen, T., Koch, D, D. (2006).
Essentials in ophthalmology : cataract and refractive surgery .
Heidelberg:
Springer.
Gaya MLA
Kohnen, Thomas., Koch, Douglas, D..
"Essentials in ophthalmology : cataract and refractive surgery".
Heidelberg:
Springer,
2006.
E-book.