Karr, C. (1978). Analytical methods for coal and coal products. Academic Press. https://doi.org/10.1016/B978-0-12-399901-6.X5001-4
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKarr, Clarence. Analytical Methods for Coal and Coal Products. New York: Academic Press, 1978. https://doi.org/10.1016/B978-0-12-399901-6.X5001-4.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKarr, Clarence. Analytical Methods for Coal and Coal Products. Academic Press, 1978. https://doi.org/10.1016/B978-0-12-399901-6.X5001-4.
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