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Peden, A. E. i G. W. Hughes, 1988: Sympatry in four species of Rhinichthys (Pisces), including the first documented occurrences of Rhinichthys umatilla in the Canadian drainages of the Columbia River. Canadian Journal of Zoology v. 66 (núm. 8): 1846-1856.
Thurow, R. F., D. C. Lee i Rieman, B. E., 1997: Distribution and status of seven native salmonids in the interior Columbia River Basin and portions of the Klamath River and Great Basins. North American Journal of Fisheries Management v. 17 (núm. 4): 1094-1110.