| APA | Smart Define. (2013). upper-level thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/upper-level/thesaurus/related |
| Chicago | Smart Define. 2013. "upper-level thesaurus" https://smartdefine.org/upper-level/thesaurus/related (accessed September 21, 2026). |
| Harvard | Smart Define 2013, upper-level thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/upper-level/thesaurus/related>. |
| MLA | Smart Define. "upper-level thesaurus" 27 June 2013. Web. 21 September 2026. <https://smartdefine.org/upper-level/thesaurus/related> |