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Hussain, S. A. (1996). "Group size, group structure and breeding in smooth-coated otter Lutra perspicillata Geoffroy in National Chambal Sanctuary". Mammalia. 60: 289–297. doi:10.1515/mamm.1996.60.2.289. S2CID85376086.
Gomez, L. & Bouhuys, J. (2018). Illegal Otter Trade in Southeast Asia(PDF). Kelana Jaya, Selangor, Malaysia: Traffic Southeast Asia Regional Office. Archived(PDF) from the original on 2019-07-25. Retrieved 2019-11-24.