Gower, D. J., A. Papadopoulou, T. M. Doherty-Bone, F. Pupin, D. San Mauro, S. P. Loader, and M. Wilkinson. “The Systematics of Boulengerula Fischeri (Amphibia: Gymnophiona: Caeciliidae) Based on Morphological and Molecular Data”. Zootaxa, vol. 2767, no. 1, Feb. 2011, pp. 14–24, doi:10.11646/zootaxa.2767.1.2.