De Castro, C. (1999). UP Manila brings much-needed eye care service to rural areas. Philippine Star.
Chicago-referens (17:e uppl.)De Castro, Cookie. "UP Manila Brings Much-needed Eye Care Service to Rural Areas." Philippine Star 1999.
MLA-referens (9:e uppl.)De Castro, Cookie. "UP Manila Brings Much-needed Eye Care Service to Rural Areas." Philippine Star, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.