Villaviray, J. (2002). PPA based on capital investment says Viray. Manila Times.
Citace podle Chicago (17th ed.)Villaviray, Johnna. "PPA Based on Capital Investment Says Viray." Manila Times 2002.
Citace podle MLA (9th ed.)Villaviray, Johnna. "PPA Based on Capital Investment Says Viray." Manila Times, 2002.
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