| APA | Smart Define. (2011). rachel carson thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rachel_carson/thesaurus/broader |
| Chicago | Smart Define. 2011. "rachel carson thesaurus" https://smartdefine.org/rachel_carson/thesaurus/broader (accessed September 24, 2026). |
| Harvard | Smart Define 2011, rachel carson thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rachel_carson/thesaurus/broader>. |
| MLA | Smart Define. "rachel carson thesaurus" 26 April 2011. Web. 24 September 2026. <https://smartdefine.org/rachel_carson/thesaurus/broader> |