Castro, E. R. (1998). Outstanding scientists cited by Nat'l Academy. Manila Bulletin.
Chicago-referens (17:e uppl.)Castro, Eddee RH. "Outstanding Scientists Cited by Nat'l Academy." Manila Bulletin 1998.
MLA-referens (9:e uppl.)Castro, Eddee RH. "Outstanding Scientists Cited by Nat'l Academy." Manila Bulletin, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.