| APA | Smart Define. (2015). out-of-date thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/out-of-date/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "out-of-date thesaurus" https://smartdefine.org/out-of-date/thesaurus/antonyms (accessed October 2, 2026). |
| Harvard | Smart Define 2015, out-of-date thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/out-of-date/thesaurus/antonyms>. |
| MLA | Smart Define. "out-of-date thesaurus" 13 April 2015. Web. 2 October 2026. <https://smartdefine.org/out-of-date/thesaurus/antonyms> |