Pinoy History - ANO ANG NANGYARI NOONG 1989 SA DAVAO? ON AUG. 13, 1989, inmates at the Metrodiscom detention center in Camp Leonor in Davao City overran a guardhouse of the facility,
Nun Who Criticized Duterte Lands in Australia - The New York Times
1989 Davao hostage crisis - Wikipedia
1989 Davao hostage crisis - Wikipedia
Inquirer Looks Back at 1989 Davao Hostage Crisis – Random Republika
Philippine President Rodrigo Duterte's controversial comments