| APA | Smart Define. (2013). heeder thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/heeder/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "heeder thesaurus" https://smartdefine.org/heeder/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2013, heeder thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/heeder/thesaurus/antonyms>. |
| MLA | Smart Define. "heeder thesaurus" 16 June 2013. Web. 22 September 2026. <https://smartdefine.org/heeder/thesaurus/antonyms> |