Uhl, X. M. (2018). The railroad, the telegraph, and other technologies. Britannica Educational Publishing in Association with Rosen Educational Services.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUhl, Xina M. The Railroad, the Telegraph, and Other Technologies. New York, NY: Britannica Educational Publishing in Association with Rosen Educational Services, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUhl, Xina M. The Railroad, the Telegraph, and Other Technologies. Britannica Educational Publishing in Association with Rosen Educational Services, 2018.
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