| APA | Smart Define. (2011). royal society of london for improving natural knowledge thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/royal_society_of_london_for_improving_natural_knowledge/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "royal society of london for improving natural knowledge thesaurus" https://smartdefine.org/royal_society_of_london_for_improving_natural_knowledge/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2011, royal society of london for improving natural knowledge thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/royal_society_of_london_for_improving_natural_knowledge/thesaurus/synonyms>. |
| MLA | Smart Define. "royal society of london for improving natural knowledge thesaurus" 26 April 2011. Web. 1 October 2026. <https://smartdefine.org/royal_society_of_london_for_improving_natural_knowledge/thesaurus/synonyms> |