Gaya APA
Spencer, W, H, .. (1983).
Orbit, eyelids, and lacrimal system (sec. 9).
California:
American Academy of Ophtalmology.
Gaya MLA
Spencer, William, H, ..
"Orbit, eyelids, and lacrimal system".
sec. 9
California:
American Academy of Ophtalmology,
1983.
Buku.