| APA | Smart Define. (2014). unreplaceable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unreplaceable/thesaurus/antonyms |
| Chicago | Smart Define. 2014. "unreplaceable thesaurus" https://smartdefine.org/unreplaceable/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2014, unreplaceable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unreplaceable/thesaurus/antonyms>. |
| MLA | Smart Define. "unreplaceable thesaurus" 25 February 2014. Web. 21 September 2026. <https://smartdefine.org/unreplaceable/thesaurus/antonyms> |