Não informado. (1920). Contractors and engineers monthly. Buttenheim-Dix Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Contractors and Engineers Monthly. New York: Buttenheim-Dix Publishing, 1920.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Contractors and Engineers Monthly. Buttenheim-Dix Publishing, 1920.
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