| APA | Smart Define. (2011). theory of organic evolution thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/theory_of_organic_evolution/thesaurus/narrower |
| Chicago | Smart Define. 2011. "theory of organic evolution thesaurus" https://smartdefine.org/theory_of_organic_evolution/thesaurus/narrower (accessed September 25, 2026). |
| Harvard | Smart Define 2011, theory of organic evolution thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/theory_of_organic_evolution/thesaurus/narrower>. |
| MLA | Smart Define. "theory of organic evolution thesaurus" 26 April 2011. Web. 25 September 2026. <https://smartdefine.org/theory_of_organic_evolution/thesaurus/narrower> |