Ubelaker, J. E., and M. D. Dailey. “Observations on <i>Kalicephalus subulatus</i≫ Molin, 1861 from Nicaragua and Mexico”. Revista De Biología Tropical, vol. 14, no. 1, July 1966, pp. 47–53, doi:10.15517/rev.biol.trop.1966.28563.