Del Castillo, L. B. (2002). Environmental management now a must due to globalization. Manila Times.
Chicago-viite (17. p.)Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times 2002.
MLA-viite (9. p.)Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times, 2002.
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