(1998). Del Rosario TOFIL awardee for business. Manila Bulletin.
Chicago Style aipamena"Del Rosario TOFIL Awardee for Business." Manila Bulletin 1998.
MLA aipamena"Del Rosario TOFIL Awardee for Business." Manila Bulletin, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.