Valino, A. (1999). A cement firm committed to clean environment. Manila Bulletin.
Chicagoスタイル(17版)引用形式Valino, Amada. "A Cement Firm Committed to Clean Environment." Manila Bulletin 1999.
MLA(9版)引用形式Valino, Amada. "A Cement Firm Committed to Clean Environment." Manila Bulletin, 1999.
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