Ortuoste, J. (2019). Manila Bay clean up. IN Opinion [column]. Manila Standard.
Chicagoスタイル(17版)引用形式Ortuoste, Jenny. "Manila Bay Clean Up. IN Opinion [column]." Manila Standard 2019.
MLA(9版)引用形式Ortuoste, Jenny. "Manila Bay Clean Up. IN Opinion [column]." Manila Standard, 2019.
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