Sicam, E. L. (1999). How reliable are telephone opinion polls. Philippine Daily Inquirer.
Chicago Style (17th ed.) CitationSicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer 1999.
ציטוט MLASicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer, 1999.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.