Reynolds, John W.. "Contributions to North American Earthworms. No.2. The Activity and Distribution of Earthworms in Tulip Poplar Stands in the Great Smoky Mountains National Park, Sevier County, Tennessee (Acanthodrilidae, Lumbricidae and Megascolecidae)." Bulletin of the Tall Timbers Research Station 11 (1972): 41-54.