2 literature references:

Author: Nelson, J.S., E.J. Crossman, H. Espinosa-PĂ©rez, L.T. Findley, C.R. Gilbert, R.N. Lea and J.D. Williams
Year: 2004
Title: Common and scientific names of fishes from the United States, Canada, and Mexico.
Source: American Fisheries Society, Special Publication 29, Bethesda, Maryland.
Author: Norris, S.M. and W.L. Minckley
Year: 1997
Title: Two new species of Etheostoma (Osteichthyes: Percidae) from Central Coahuila, Northern Mexico.
Source: Ichthyol. Explor. Freshwat. 8(2):159-176.