| APA | Smart Define. (1970). blue-black night sky thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/blue-black_night_sky/thesaurus/broader |
| Chicago | Smart Define. 1970. "blue-black night sky thesaurus" https://smartdefine.org/blue-black_night_sky/thesaurus/broader (accessed September 25, 2026). |
| Harvard | Smart Define 1970, blue-black night sky thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/blue-black_night_sky/thesaurus/broader>. |
| MLA | Smart Define. "blue-black night sky thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/blue-black_night_sky/thesaurus/broader> |