Pelton, Michael R., and Larry C. Marcum. The Potential Use of Radioisotopes for Determining Densities of Black Bears and other Carnivores In Proceedings of the 1975 Predator Symposium , Edited by Robert L. Phillips and Charles Jonkel. Missoula, MT: Montana Forest and Conservation Experiement Station , 1975.

Beeman, Larry Eugene, Michael R. Pelton, and Larry C. Marcum. "An Evaluation of Etorphine (M99) for Immobilizing Black Bears." Journal of Wildlife Management 38, no. 3 (1974): 568-569.

Marcum, Larry C.. An Evaluation of Radioactive Feces-Tagging as a Technique for Determining Population Densities of the Black Bear (Ursus americanus) in the Great Smoky Mountains National Park. Knoxville, TN: University of Tennessee, 1974.

Beeman, Larry Eugene, Michael R. Pelton, and Larry C. Marcum. "Use of M99 Etorphine for Immobilzing Black Bears." The Journal of Wildlife Management 38, no. 3 (1974): 586-569.