Calumpita, R. E. (2005). Hospitals lack waste treatment. Manila Times.
Chicagoスタイル(17版)引用形式Calumpita, Ronnie E. "Hospitals Lack Waste Treatment." Manila Times 2005.
MLA(9版)引用形式Calumpita, Ronnie E. "Hospitals Lack Waste Treatment." Manila Times, 2005.
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