Del Castillo, L. B. (2002). Environmental management now a must due to globalization. Manila Times.
Chicago-referens (17:e uppl.)Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times 2002.
MLA-referens (9:e uppl.)Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.