| APA | Smart Define. (1970). impossible color thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impossible_color/thesaurus/related |
| Chicago | Smart Define. 1970. "impossible color thesaurus" https://smartdefine.org/impossible_color/thesaurus/related (accessed September 23, 2026). |
| Harvard | Smart Define 1970, impossible color thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impossible_color/thesaurus/related>. |
| MLA | Smart Define. "impossible color thesaurus" 1 January 1970. Web. 23 September 2026. <https://smartdefine.org/impossible_color/thesaurus/related> |