Central place foraging for non-food items: determination of the stick size value relationship of house building materials collected by eastern woodrats. The American Naturalist. 1984;123:841 -853. doi:http://www.jstor.org/stable/2460904..
Woodrats collecting house building materials: central place foraging for nonfood items. 1982;MS Thesis:1 -42. Available at: http://krex.k-state.edu/dspace/handle/2097/12805..