Spira, T. P. (2011). Wildflowers and plant communities of the southern Appalachian Mountains and Piedmont: A naturalist's guide to the Carolinas, Virginia, Tennessee, and Georgia. University of North Carolina Press.

Spira, Timothy P. Wildflowers and Plant Communities of the Southern Appalachian Mountains and Piedmont: A Naturalist's Guide to the Carolinas, Virginia, Tennessee, and Georgia. Chapel Hill [N.C.]: University of North Carolina Press, 2011.

Spira, Timothy P. Wildflowers and Plant Communities of the Southern Appalachian Mountains and Piedmont: A Naturalist's Guide to the Carolinas, Virginia, Tennessee, and Georgia. University of North Carolina Press, 2011.