(1999). New Bayer animal health and hygiene plant unveiled. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"New Bayer Animal Health and Hygiene Plant Unveiled." Manila Bulletin 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"New Bayer Animal Health and Hygiene Plant Unveiled." Manila Bulletin, 1999.
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