| APA | Smart Define. (2013). plug-in thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/plug-in/thesaurus/narrower |
| Chicago | Smart Define. 2013. "plug-in thesaurus" https://smartdefine.org/plug-in/thesaurus/narrower (accessed September 20, 2026). |
| Harvard | Smart Define 2013, plug-in thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/plug-in/thesaurus/narrower>. |
| MLA | Smart Define. "plug-in thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/plug-in/thesaurus/narrower> |