McGee, Jerry. Voorheis Estate: Cultural Landscape Report. Gatlinburg, TN: Great Smoky Mountains National Park, 2001.

McGee, Jerry, David L. Chapman, Pei-Lin Yu, Annette Hartigan, Maryann Neubert, Sharon Williams, and Lucy-Jane Fitzsimmons. Voorheis Estate (Currently Known as Twin Creeks Natural Resource Center) Cultural Landscape Report. Gatlinburg, Tennessee: Great Smoky Mountains National Park, 2001.