| APA | Smart Define. (2013). optical density thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/optical_density/thesaurus/related |
| Chicago | Smart Define. 2013. "optical density thesaurus" https://smartdefine.org/optical_density/thesaurus/related (accessed September 22, 2026). |
| Harvard | Smart Define 2013, optical density thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/optical_density/thesaurus/related>. |
| MLA | Smart Define. "optical density thesaurus" 18 May 2013. Web. 22 September 2026. <https://smartdefine.org/optical_density/thesaurus/related> |