Villaviray, J. (2002). PPA based on capital investment says Viray. Manila Times.
芝加哥风格引文Villaviray, Johnna. "PPA Based on Capital Investment Says Viray." Manila Times 2002.
MLA引文Villaviray, Johnna. "PPA Based on Capital Investment Says Viray." Manila Times, 2002.
警告：这些引文格式不一定是100％准确.