References - Laguna Medialuna
Literature

Bean, T.H., 1891, "Notes on fishes collected in México", Procedures U.S. Natural Museum.

Meek, Seth Eugene, 1904, "The fresh water fishes of México north of the isthmus of Tehuantepec", Field Columbian Museum, Vol. V:1-252.

Miller, R.R. and J.N. Taylor, 1983 "Cichlid fishes (Genus Cichlasoma) of the Rio Pánuco Basin, eastern México, with description of a new species", Occasional papers of the Museum of Natural History, the University of Kansas 104; pp 1-24.

Regan, C. Tate, 1905. "A revision of the fishes of the American Cichild Genus Cichlosoma and of the Allied Genera". Ann. Mag. Nat. Hist. Ser 7(16): 60-77, 225-243, 432-445.

Velasquez Navarro, Carlos, 1984, "Rioverde, la ciudad y el valle", Ayuntamiento de Rioverde, S.L.P. pp:6-11.

 
Web resources
please note that URL of following documents may change. VN doesn't assume responsibility of their up - to date status
Arroyo Medialuna - and its endemic cychlid
http://www.cichlidae.com/articles/a001-es.html
CONABIO - Llanura del Río Verde
http://www.conabio.gob.mx/conocimiento/regionalizacion/doctos/rtp_097.pdf