Perpeña, E. C. (2001). Garbage crisis mirrors social decay. Manila Times.
芝加哥风格引文Perpeña, Ed C. "Garbage Crisis Mirrors Social Decay." Manila Times 2001.
MLA引文Perpeña, Ed C. "Garbage Crisis Mirrors Social Decay." Manila Times, 2001.
警告：这些引文格式不一定是100％准确.