| APA | Smart Define. (2015). dark as night thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/dark_as_night/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "dark as night thesaurus" https://smartdefine.org/dark_as_night/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, dark as night thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/dark_as_night/thesaurus/synonyms>. |
| MLA | Smart Define. "dark as night thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/dark_as_night/thesaurus/synonyms> |