Simpson, Marcus B., and Douglas H. Pratt. Birds of the Blue Ridge Mountains : A Guide for the Blue Ridge Parkway, Great Smoky Mountains, Shenandoah National Park, and Neighboring Areas. Chapel Hill, NC: University of North Carolina , 1992.

Simpson, Marcus B.. "In Quest of the Saw-Whet Owl." The Chat 34, no. 3 (1970): 59-62.