| APA | Smart Define. (2013). natural history thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/natural_history/thesaurus/related |
| Chicago | Smart Define. 2013. "natural history thesaurus" https://smartdefine.org/natural_history/thesaurus/related (accessed October 2, 2026). |
| Harvard | Smart Define 2013, natural history thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/natural_history/thesaurus/related>. |
| MLA | Smart Define. "natural history thesaurus" 19 May 2013. Web. 2 October 2026. <https://smartdefine.org/natural_history/thesaurus/related> |