• [Wiki] http://en.wikipedia.org/wiki/Bufo_bufo.
• [EoL] http://eol.org/pages/331046/details.
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• [SmitFish1975] Smith, R. J. and Fischer, H. M. (1975). Breeding and rearing the Colombian giant toad at Los Angeles Zoo. International Zoo Yearbook, 15:87--89. doi:10.1111/j.1748-1090.1975.tb01360.x.