| APA | Smart Define. (2011). a horizon thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/a_horizon/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "a horizon thesaurus" https://smartdefine.org/a_horizon/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2011, a horizon thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/a_horizon/thesaurus/synonyms>. |
| MLA | Smart Define. "a horizon thesaurus" 26 April 2011. Web. 27 September 2026. <https://smartdefine.org/a_horizon/thesaurus/synonyms> |