| APA | Smart Define. (2016). economical thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/economical/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "economical thesaurus" https://smartdefine.org/economical/thesaurus/antonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2016, economical thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/economical/thesaurus/antonyms>. |
| MLA | Smart Define. "economical thesaurus" 23 February 2016. Web. 30 September 2026. <https://smartdefine.org/economical/thesaurus/antonyms> |