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↑ Cho, Hee-Sun; Choi, Kwang-Hee; Lee, Sang-Don; Park, Young-Seuk (2009). "Characterizing habitat preference of Eurasian river otter (Lutra lutra) in streams using a self-organizing map". Limnology. 10 (3): 203. doi:10.1007/s10201-009-0275-7.
↑ Lanszki, József, Molnár, M. and Molnár, T. (2006). "Factors affecting the predation of otter (Lutra lutra) on European pond turtle (Emys orbicularis)". Journal of Zoology. 270 (2): 219. doi:10.1111/j.1469-7998.2006.00132.x.CS1 maint: multiple names: authors list (link)
↑ Koepfli, K-P.; และคณะ (2008). "Multigene phylogeny of the Mustelidae: Resolving relationships, tempo and biogeographic history of a mammalian adaptive radiation". BMC Biology. 6 (10). doi:10.1186/1741-7007-6-10. Explicit use of et al. in: |author= (help)
