Flora of the Pacific Northwest, Hitchcock and Cronquist, University of Washington Press, 7th printing, 1990.
Seeds of the Woody Plants in North America, Young and Young, Dioscorides Press, 1992.
The Reference Manual of Woody Plant Propagation: From Seed to Tissue Culture, Dirr and Heuser, Varsity Press, 1987.
Glacier Park Native Plant Nursery Propagation Records, unpublished.
Seeds: Ecology, Biogeography, and Evolution of Dormancy and Germination, Baskin and Baskin, Academic Press, 1998.
1996 Revegetation Monitoring Report, Glacier National Park, Asebrook, J., Lamb, B., and Funk, T., unpublished.
1998 Revegetation Monitoring Report, Glacier National Park, Asebrook, J. and Kimball, S., unpublished.