RICHARDSON J F. (2006). COULSON AND RICHARDSON CHEMICALS (5TH.). BUTTERWORTH-HEINEMANN.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRICHARDSON J F. COULSON AND RICHARDSON CHEMICALS. 5TH. NEW DELHI: BUTTERWORTH-HEINEMANN, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRICHARDSON J F. COULSON AND RICHARDSON CHEMICALS. 5TH. BUTTERWORTH-HEINEMANN, 2006.
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