The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
- Brusca, Richard C., and Gary J. Brusca. 2002. Invertebrates, Second Edition. xx + 936
- F. J. Vega and P. García-Barrera. 2006. El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico. Revista Mexicana de Ciencias Geológicas 23(3):323-333