(2002). Many herbicides and pesticides may do more harm than good. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Many Herbicides and Pesticides May Do More Harm than Good." Manila Bulletin 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Many Herbicides and Pesticides May Do More Harm than Good." Manila Bulletin, 2002.
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