| APA | Smart Define. (1970). non-essential purpose thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/non-essential_purpose/thesaurus/antonyms |
| Chicago | Smart Define. 1970. "non-essential purpose thesaurus" https://smartdefine.org/non-essential_purpose/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 1970, non-essential purpose thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/non-essential_purpose/thesaurus/antonyms>. |
| MLA | Smart Define. "non-essential purpose thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/non-essential_purpose/thesaurus/antonyms> |