Rovito, S. M., T. J. Papenfuss, and C. R. Vásquez-Almazán. “A New Species of Sibon (Squamata: Colubridae) from the Mountains of Eastern Guatemala”. Zootaxa, vol. 3266, no. 1, Apr. 2012, pp. 62–68, doi:10.11646/zootaxa.3266.1.5.