Sicam, E. L. (1999). How reliable are telephone opinion polls. Philippine Daily Inquirer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer, 1999.
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