Micancin, J. P. and Mette, J. T. (2009) “Acoustic and morphological identification of the sympatric cricket frogs Acris crepitans and A. gryllus and the disappearance of A. gryllus near the edge of its range”, Zootaxa. Auckland, New Zealand, 2076(1), pp. 1–36. doi: 10.11646/zootaxa.2076.1.1.