Savage, J. M., and K. R. Lips. “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, vol. 41, no. 3B, Dec. 1993, pp. 817–842, https://revistas.ucr.ac.cr/index.php/rbt/article/view/24109.