Não informado. (1919). Cement, Mill and Quarry. National Trade Journals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Cement, Mill and Quarry. New York: National Trade Journals, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Cement, Mill and Quarry. National Trade Journals, 1919.
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