Ong, E. D. (2002). RP's language advantage slowly slipping away, notes call center leader. Manila Bulletin.
Citazione stile Chigago Style (17a edizione)Ong, Edison Dy. "RP's Language Advantage Slowly Slipping Away, Notes Call Center Leader." Manila Bulletin 2002.
Citatione MLA (9a ed.)Ong, Edison Dy. "RP's Language Advantage Slowly Slipping Away, Notes Call Center Leader." Manila Bulletin, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.