Khonsue, Wichase; Matsui, Masafumi; Hirai, Toshiaki; Misawa, Yasuchika (2001). “Age determination of wrinkled frog, Rana rugosa with special reference to high variation in postmetamorphic body size (Amphibia: Ranidae)”. 《Zoological Science》 18 (4): 605-612. doi:10.2108/zsj.18.605.