Siapno, F. E. (1998). Green brigade: A call to environmental action. Manila Bulletin.
Chicagoスタイル(17版)引用形式Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin 1998.
MLA(9版)引用形式Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin, 1998.
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