Redfield, J. H., Gray, A., Marsh, J. 1., & Redfield, W. C. 1. (2012). In search of Shortia: With Asa Gray in North Carolina 1879. Dillsburg, PA: John Randolph Marsh Pub..

Redfield, John Howard, Asa Gray, John 1944- Marsh, and W. C. 1789-1857 Redfield. In Search of Shortia: With Asa Gray in North Carolina 1879. Dillsburg, PA: John Randolph Marsh Pub., 2012.

Redfield, John Howard, Asa Gray, John 1944- Marsh, and W. C. 1789-1857 Redfield. In Search of Shortia: With Asa Gray in North Carolina 1879. Dillsburg, PA: John Randolph Marsh Pub., 2012.