Zuffi, Marco A. L., and Annalisa Plaitano. 2007. “Similarities and Differences in Adult Tortoises: A Morphological Approach and Its Implication for Reproduction and Mobility Between Species”. Acta Herpetologica 2 (2):79-86. https://doi.org/10.13128/Acta_Herpetol-2220.