Hammer, D. Ophthalmic Technologies XXXII. SPIE Digital Library.
Chicago Style (17th ed.) ZitazioaHammer, Daniel. Ophthalmic Technologies XXXII. SPIE Digital Library.
MLA (9th ed.) ZitazioaHammer, Daniel. Ophthalmic Technologies XXXII. SPIE Digital Library.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.