| APA | Smart Define. (2013). long-ago thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/long-ago/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "long-ago thesaurus" https://smartdefine.org/long-ago/thesaurus/antonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2013, long-ago thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/long-ago/thesaurus/antonyms>. |
| MLA | Smart Define. "long-ago thesaurus" 27 June 2013. Web. 26 September 2026. <https://smartdefine.org/long-ago/thesaurus/antonyms> |