| APA | Smart Define. (2015). radioisotope thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/radioisotope/thesaurus/narrower |
| Chicago | Smart Define. 2015. "radioisotope thesaurus" https://smartdefine.org/radioisotope/thesaurus/narrower (accessed September 27, 2026). |
| Harvard | Smart Define 2015, radioisotope thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/radioisotope/thesaurus/narrower>. |
| MLA | Smart Define. "radioisotope thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/radioisotope/thesaurus/narrower> |