Pagsanjan-Estrera, I. (2003). Drug use lower in public than private schools: Drug testing concluded in Metro Manila schools. Philippine Collegian.
Dyfyniad Arddull ChicagoPagsanjan-Estrera, Iris. "Drug Use Lower in Public than Private Schools: Drug Testing Concluded in Metro Manila Schools." Philippine Collegian 2003.
Dyfyniad MLAPagsanjan-Estrera, Iris. "Drug Use Lower in Public than Private Schools: Drug Testing Concluded in Metro Manila Schools." Philippine Collegian, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.