Alarilla, J. G. (1999). PLDT opens call management cneter to monitor center to monitor voice traffic. Philippine Daily Inquirer.
Lua i Stíl Chicago (17ú heag.)Alarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer 1999.
Lua MLA (9ú heag.)Alarilla, Joey G. "PLDT Opens Call Management Cneter to Monitor Center to Monitor Voice Traffic." Philippine Daily Inquirer, 1999.
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