Lucas, D. (2006). Cell phone penetration rate seen to peak at 50%. Philippine Daily Inquirer.
Chicago-viite (17. p.)Lucas, Daxim. "Cell Phone Penetration Rate Seen to Peak at 50%." Philippine Daily Inquirer 2006.
MLA-viite (9. p.)Lucas, Daxim. "Cell Phone Penetration Rate Seen to Peak at 50%." Philippine Daily Inquirer, 2006.
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