Panaligan, R. G. (1999). Environmental protection pledged by 10 countries. Manila Bulletin.
Chicagoスタイル(17版)引用形式Panaligan, Rey G. "Environmental Protection Pledged by 10 Countries." Manila Bulletin 1999.
MLA(9版)引用形式Panaligan, Rey G. "Environmental Protection Pledged by 10 Countries." Manila Bulletin, 1999.
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