Savage, J.M. and Lips, K.R. 1993. A review of the status and biogeography of the lizard genera <i>Celestus</i> and <i>Diploglossus</i> (Squamata: Anguidae), with description of two new species from Costa Rica. Revista de Biología Tropical. 41, 3B (Dec. 1993), 817–842.