Alarilla, J. G. (1999). PLDT opens call management cneter to monitor center to monitor voice traffic. Philippine Daily Inquirer.
Chicago Style (17. basım) AtıfAlarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer 1999.
MLA (9th ed.) AtıfAlarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer, 1999.
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