Symons, T. W., & Downing, A. (1882). Report of an examination of the upper Columbia River and the territory in its vicinity in September and October, 1881: To determine its navigability, and adaptability to steamboat transportation. G.P.O..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSymons, T. W., और Alfred Downing. Report of an Examination of the Upper Columbia River and the Territory in Its Vicinity in September and October, 1881: To Determine Its Navigability, and Adaptability to Steamboat Transportation. Washington [D.C.]: G.P.O., 1882.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSymons, T. W., और Alfred Downing. Report of an Examination of the Upper Columbia River and the Territory in Its Vicinity in September and October, 1881: To Determine Its Navigability, and Adaptability to Steamboat Transportation. G.P.O., 1882.