Bier, J. A. (1993). 1830-1870 western emigrant trails, major trails, cutoffs, and alternates. Oregon-California Trails Assoc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBier, James Allen. 1830-1870 Western Emigrant Trails, Major Trails, Cutoffs, and Alternates. Independence, Mo.: Oregon-California Trails Assoc., 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBier, James Allen. 1830-1870 Western Emigrant Trails, Major Trails, Cutoffs, and Alternates. Oregon-California Trails Assoc., 1993.
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