Murray, D. F., & Schell, A. (1979). Threatened and endangered plants of Alaska. [Washington]: U.S. Dept. of Agriculture, Forest Service : U.S. Dept. of the Interior, Bureau of Land Management.

Murray, David F., and Ann-Lillian Schell. Threatened and Endangered Plants of Alaska. [Washington]: U.S. Dept. of Agriculture, Forest Service : U.S. Dept. of the Interior, Bureau of Land Management, 1979.

Murray, David F., and Ann-Lillian Schell. Threatened and Endangered Plants of Alaska. [Washington]: U.S. Dept. of Agriculture, Forest Service : U.S. Dept. of the Interior, Bureau of Land Management, 1979.