Poyarkov, Jr., N. A., J. Che, M.-S. Min, M. Kuro-O, F. Yan, C. Li, K. Iizuka, and D. R. Vieites. “Review of the Systematics, Morphology and Distribution of Asian Clawed Salamanders, Genus Onychodactylus (Amphibia, Caudata: Hynobiidae), With the Description of Four New Species”. Zootaxa, vol. 3465, no. 1, Sept. 2012, pp. 1–106, doi:10.11646/zootaxa.3465.1.1.