Hafen, L. R. (1926). The overland mail, 1849-1869: Promoter of settlement, precursor of railroads. A.H. Clark.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHafen, LeRoy R. The Overland Mail, 1849-1869: Promoter of Settlement, Precursor of Railroads. Cleveland: A.H. Clark, 1926.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHafen, LeRoy R. The Overland Mail, 1849-1869: Promoter of Settlement, Precursor of Railroads. A.H. Clark, 1926.
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