Pagsanjan-Estrera, I. (2003). Environmentalists slam Bt corn commercialization: Hunger strike continues. Philippine Collegian.
Chicago-viite (17. p.)Pagsanjan-Estrera, Iris. "Environmentalists Slam Bt Corn Commercialization: Hunger Strike Continues." Philippine Collegian 2003.
MLA-viite (9. p.)Pagsanjan-Estrera, Iris. "Environmentalists Slam Bt Corn Commercialization: Hunger Strike Continues." Philippine Collegian, 2003.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.