Handbook of Texas Online - Current and historical information about McMullen County. - http://www.tsha.utexas.edu/handbook/online/articles/MM/hcm9.html
Amphibians and Reptiles in McMullen County - Texas Cooperative Wildlife Collection list of species found in the county. - http://wfscnet.tamu.edu/tcwc/checklist/MCMUL162.HTM