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2. How to get fat: nutritional mechanisms of seasonal fat accumulation in migratory songbirds;Bairlein;Naturewissenschaften,2002
3. Baril, L.M., 2009. Change in deciduous woody vegetation, implications of increased willow (Salix spp.) growth for bird species diversity and willow species composition in and around Yellowstone National Park’s northern range. MS thesis, Montana State University, Bozeman, Montana.
4. Ecology of Ungulates and their Winter Range in Northern Yellowstone National Park: Research and Synthesis 1962–1970;Barmore,2003
5. Bartos, D.L., 2001. Landscape dynamics of aspen and conifer forests. In: Shepperd, W.D., Binkley, D., Bartos, D.L., Stohlgren, T.J., Eskew, L.G. (Compilers), Sustaining Aspen in Western Landscapes: Symposium Proceedings. USDA Forest Serv., Proc. RMRS-P-18, Fort Collins, CO, pp. 5–14.