1. Old-growth red spruce communities in the mid-Appalachians;Adams;Vegetatio,1989
2. The second atlas of breeding birds in West Virginia,2021
3. Birds of the World,2020
4. Byers, E. A., K. C. Love, K. R. Haider, E. J. Burks, and J. E. Rowan. 2013. Red Spruce (Picea rubens) cover in West Virginia. Version 1.0. West Virginia Division of Natural Resources, Central Appalachian Spruce Restoration Initiative, Appalachian Forest Heritage Area Americorps, Monongahela National Forest, and US Fish and Wildlife Service. Available online at .
5. Causes of warm-edge range limits: systematic review, proximate factors and implications for climate change;Cahill;J. Biogeogr.,2014