| APA | Smart Define. (2013). heavy-duty thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/heavy-duty/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "heavy-duty thesaurus" https://smartdefine.org/heavy-duty/thesaurus/antonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2013, heavy-duty thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/heavy-duty/thesaurus/antonyms>. |
| MLA | Smart Define. "heavy-duty thesaurus" 28 June 2013. Web. 30 September 2026. <https://smartdefine.org/heavy-duty/thesaurus/antonyms> |