| APA | Smart Define. (2015). aquatic mammal thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/aquatic_mammal/thesaurus/narrower |
| Chicago | Smart Define. 2015. "aquatic mammal thesaurus" https://smartdefine.org/aquatic_mammal/thesaurus/narrower (accessed September 30, 2026). |
| Harvard | Smart Define 2015, aquatic mammal thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/aquatic_mammal/thesaurus/narrower>. |
| MLA | Smart Define. "aquatic mammal thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/aquatic_mammal/thesaurus/narrower> |