| APA | Smart Define. (2015). radon thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/radon/thesaurus/broader |
| Chicago | Smart Define. 2015. "radon thesaurus" https://smartdefine.org/radon/thesaurus/broader (accessed September 20, 2026). |
| Harvard | Smart Define 2015, radon thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/radon/thesaurus/broader>. |
| MLA | Smart Define. "radon thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/radon/thesaurus/broader> |