Alarilla, J. G. (1999). PLDT opens call management cneter to monitor center to monitor voice traffic. Philippine Daily Inquirer.
Dyfyniad Arddull ChicagoAlarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer 1999.
Dyfyniad MLAAlarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer, 1999.
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