• [Wiki] http://en.wikipedia.org/wiki/Capra_hircus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Capra_hircus.
• [ADW] http://animaldiversity.org/accounts/Capra_hircus/.
• [AltmDitt1969] Altman, P. L. and Dittmer, D. S. (1969). Biological Data Book. Federation of American Societies of Experimental Biology, Bethesda, Maryland.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [ZullRick1984] Zullinger, E. M., Ricklefs, R. E., Redford, K. H., and Mace, G. M. (1984). Fitting sigmoidal equations to mammalian growth curves. Journal of Mammalogy, 65(4):607--636.