Lucas, D. (2006). Cell phone penetration rate seen to peak at 50%. Philippine Daily Inquirer.
Chicago-referens (17:e uppl.)Lucas, Daxim. "Cell Phone Penetration Rate Seen to Peak at 50%." Philippine Daily Inquirer 2006.
MLA-referens (9:e uppl.)Lucas, Daxim. "Cell Phone Penetration Rate Seen to Peak at 50%." Philippine Daily Inquirer, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.