| APA | Smart Define. (1970). half-tone negative thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/half-tone_negative/thesaurus/broader |
| Chicago | Smart Define. 1970. "half-tone negative thesaurus" https://smartdefine.org/half-tone_negative/thesaurus/broader (accessed September 26, 2026). |
| Harvard | Smart Define 1970, half-tone negative thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/half-tone_negative/thesaurus/broader>. |
| MLA | Smart Define. "half-tone negative thesaurus" 1 January 1970. Web. 26 September 2026. <https://smartdefine.org/half-tone_negative/thesaurus/broader> |