Olchondra, R. T. Text through Yahoo! mail for free!. IN Business. Philippine Daily Inquirer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOlchondra, Riza T. "Text Through Yahoo! Mail for Free!. IN Business." Philippine Daily Inquirer .
एमएलए (9वां संस्करण) प्रशस्ति पत्रOlchondra, Riza T. "Text Through Yahoo! Mail for Free!. IN Business." Philippine Daily Inquirer, .
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