Estupigan, R. (1999). Philippine tourism industry on the uprising. Manila Bulletin.
Chicagoスタイル(17版)引用形式Estupigan, Ruth. "Philippine Tourism Industry on the Uprising." Manila Bulletin 1999.
MLA(9版)引用形式Estupigan, Ruth. "Philippine Tourism Industry on the Uprising." Manila Bulletin, 1999.
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