(1997). Safeguarding the coastal environment. IN Editorial [column]. Manila Bulletin.
Chicago Style aipamena"Safeguarding the Coastal Environment. IN Editorial [column]." Manila Bulletin 1997.
MLA aipamena"Safeguarding the Coastal Environment. IN Editorial [column]." Manila Bulletin, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.