Sicam, E. L. (1999). How reliable are telephone opinion polls. Philippine Daily Inquirer.
Chicagoスタイル(17版)引用形式Sicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer 1999.
MLA(9版)引用形式Sicam, Edmund L. "How Reliable Are Telephone Opinion Polls." Philippine Daily Inquirer, 1999.
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