Flora of the Pacific Northwest, Hitchcock and Cronquist, 7th edition, University of Washington Press, 1973.
Seeds: Ecology, Biogeography, and Evolution of Dormancy and Germination, Baskin and Baskin, Academic Press, 1998.
Growing Colorado Plants from Seed, A State of the Art, Vol. 3: Forbs, U.S. Fish and Wildlife Service, NTIS General Technical Report, 1982.
Glacier National Park Native Plant Nursery Propagation Records, unpublished.