San Juan, T. S. (1999). Vigan struggle to protect past. Philippine Daily Inquirer.
Chicagoスタイル(17版)引用形式San Juan, Thelma S. "Vigan Struggle to Protect Past." Philippine Daily Inquirer 1999.
MLA(9版)引用形式San Juan, Thelma S. "Vigan Struggle to Protect Past." Philippine Daily Inquirer, 1999.
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