| APA | Smart Define. (2013). color tube thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/color_tube/thesaurus/narrower |
| Chicago | Smart Define. 2013. "color tube thesaurus" https://smartdefine.org/color_tube/thesaurus/narrower (accessed September 30, 2026). |
| Harvard | Smart Define 2013, color tube thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/color_tube/thesaurus/narrower>. |
| MLA | Smart Define. "color tube thesaurus" 18 May 2013. Web. 30 September 2026. <https://smartdefine.org/color_tube/thesaurus/narrower> |