United States. Department of the Interior & Simpson, J. H. (1866). Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific railroad .. Gov. Print. Off..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Department of the Interior और J. H. Simpson. Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific Railroad .. [Washington: Gov. Print. Off., 1866.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Department of the Interior और J. H. Simpson. Report of the Secretary of the Interior: Report of James H. Simpson on the Union Pacific Railroad .. Gov. Print. Off., 1866.
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