World Health Organization. (2000). Air quality guidelines for europe (2nd-ed.). World Health Organization.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Air Quality Guidelines for Europe. 2nd-ed. Copenhagen: World Health Organization, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Air Quality Guidelines for Europe. 2nd-ed. World Health Organization, 2000.
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