| APA | Smart Define. (2013). 1000000000 thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/1000000000/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "1000000000 thesaurus" https://smartdefine.org/1000000000/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2013, 1000000000 thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/1000000000/thesaurus/synonyms>. |
| MLA | Smart Define. "1000000000 thesaurus" 17 June 2013. Web. 21 September 2026. <https://smartdefine.org/1000000000/thesaurus/synonyms> |