1. Stipa lemmonii Vasey Scribner Poaceae: a taxonomic and distributional study;Barkworth;Madrono,1984
2. Function and teleology;Beckner,1976
3. Evolution as Entropy;Brooks,1988
4. The Jackknife, the Bootstrap and other Resampling Plans. SIAM Monograph number 38;Efron,1982
5. Vascular Plants of the Pacific Northwest. Part 1, Vascular Cryptograms, Gymnosperms, and Monocotyledons;Hitchcock,1969