Cal, B. (2005). High School drop out invents one of the world's best antipollution devices. Manila Times.
Citace podle Chicago (17th ed.)Cal, Ben. "High School Drop Out Invents One of the World's Best Antipollution Devices." Manila Times 2005.
Citace podle MLA (9th ed.)Cal, Ben. "High School Drop Out Invents One of the World's Best Antipollution Devices." Manila Times, 2005.
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