R. G.  Verb, Bixby, R. J., Casamatta, D. A., Chiasson, W. B., Filkin, N. R., Hall, M. M., Hamsher, S. E., Taylor, D. A., and Vis, M. L., ?Checklist of algal taxa from Ohio?s unglaciated Western Allegheny Plateau exclusive of the Ohio River?, Ohio Biological Survey Miscellaneous Contribution No. 11, 2006.