| APA | Smart Define. (2016). retro thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/retro/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "retro thesaurus" https://smartdefine.org/retro/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, retro thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/retro/thesaurus/synonyms>. |
| MLA | Smart Define. "retro thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/retro/thesaurus/synonyms> |