Horn, Dennis, Tavia Cathcart, Thomas E. Hemmerly, David Duhl, and Dennis Horn. Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians. Lone Pine Pub., 2005.

Netherton, John, David Duhl, and David P. Bager. A Guide to Photography and the Smoky Mountains. Nashville, TN: Cumberland Valley Press, 1988.