Knowles, L. (1948). Economic development in the nineteenth century. Routledge and Kegan Paul.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKnowles, L.C.A. Economic Development in the Nineteenth Century. Routledge and Kegan Paul, 1948.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKnowles, L.C.A. Economic Development in the Nineteenth Century. Routledge and Kegan Paul, 1948.
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