Sawyer, R. W. (1932). Henry Larcom Abbott and the Pacific railroad surveys in Oregon, 1855.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSawyer, Robert W. Henry Larcom Abbott and the Pacific Railroad Surveys in Oregon, 1855. [n. p, 1932.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSawyer, Robert W. Henry Larcom Abbott and the Pacific Railroad Surveys in Oregon, 1855. 1932.
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