(1997). PETA marks 30th anniversary with a yearlong celebration. Philippine Star.
Chicago Style aipamena"PETA Marks 30th Anniversary with a Yearlong Celebration." Philippine Star 1997.
MLA aipamena"PETA Marks 30th Anniversary with a Yearlong Celebration." Philippine Star, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.