Bininda-Emonds OR, Gittleman JL, Purvis A (1999). "Building large trees by combining phylogenetic information: a complete phylogeny of the extant Carnivora (Mammalia)". Biol Rev Camb Philos Soc74 (2): 143–75. PMID10396181. doi:10.1017/S0006323199005307.
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Rachel Smith, John Davidson. Otters For Kids. Google books. Páxina 13. [1]
Bininda-Emonds OR, Gittleman JL, Purvis A (1999). "Building large trees by combining phylogenetic information: a complete phylogeny of the extant Carnivora (Mammalia)". Biol Rev Camb Philos Soc74 (2): 143–75. PMID10396181. doi:10.1017/S0006323199005307.