| APA | Smart Define. (2013). cobalt ultramarine thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/cobalt_ultramarine/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "cobalt ultramarine thesaurus" https://smartdefine.org/cobalt_ultramarine/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2013, cobalt ultramarine thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/cobalt_ultramarine/thesaurus/synonyms>. |
| MLA | Smart Define. "cobalt ultramarine thesaurus" 19 May 2013. Web. 27 September 2026. <https://smartdefine.org/cobalt_ultramarine/thesaurus/synonyms> |