Frazier, J., and P. Matyot. “On the Identity of Monsieur Dussumier’s Dutch Tortoise and the Lectotype of Testudo Dussumieri Gray, 1831”. Zootaxa, vol. 2665, no. 1, Nov. 2010, pp. 29–50, doi:10.11646/zootaxa.2665.1.2.