Parungao, R. (1998). Red tide spreads to Bulacan waters. Manila Times.
Chicago Style aipamenaParungao, Rhowena. "Red Tide Spreads to Bulacan Waters." Manila Times 1998.
MLA aipamenaParungao, Rhowena. "Red Tide Spreads to Bulacan Waters." Manila Times, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.