| APA | Smart Define. (2011). two by four thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/two_by_four/thesaurus/antonyms |
| Chicago | Smart Define. 2011. "two by four thesaurus" https://smartdefine.org/two_by_four/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2011, two by four thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/two_by_four/thesaurus/antonyms>. |
| MLA | Smart Define. "two by four thesaurus" 2 May 2011. Web. 23 September 2026. <https://smartdefine.org/two_by_four/thesaurus/antonyms> |