| APA | Smart Define. (2013). keep open thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/keep_open/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "keep open thesaurus" https://smartdefine.org/keep_open/thesaurus/antonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2013, keep open thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/keep_open/thesaurus/antonyms>. |
| MLA | Smart Define. "keep open thesaurus" 18 May 2013. Web. 20 September 2026. <https://smartdefine.org/keep_open/thesaurus/antonyms> |