(1999). Potential environment hazards by detergents revealled. Philippine Star.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Potential Environment Hazards by Detergents Revealled." Philippine Star 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Potential Environment Hazards by Detergents Revealled." Philippine Star, 1999.
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