Bibliography
Wake, D. B., K. P. Yanev, and M. M. Frelow . 1989. Sympatry and hybridization in a 'ring species': the plethodontid salamander Ensatina eschscholtzii. In: Otte, D., and J. A. Endler (Ed.), Speciation and its Consequences. Sinauer Associates, Inc. [Sunderland, Massachusetts], 134-157.
