R.N.H. Bulmer; M.J. Tyler (1968). "Karam classification of frogs". The Journal of the Polynesian Society. 77 (4): 333–385. Archived from the original on February 8, 2018. Retrieved August 24, 2020.
R.N.H. Bulmer; M.J. Tyler (1968). "Karam classification of frogs". The Journal of the Polynesian Society. 77 (4): 333–385. Archived from the original on February 8, 2018. Retrieved August 24, 2020.