| APA | Smart Define. (2011). out of the clear blue sky thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/out_of_the_clear_blue_sky/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "out of the clear blue sky thesaurus" https://smartdefine.org/out_of_the_clear_blue_sky/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2011, out of the clear blue sky thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/out_of_the_clear_blue_sky/thesaurus/synonyms>. |
| MLA | Smart Define. "out of the clear blue sky thesaurus" 20 May 2011. Web. 28 September 2026. <https://smartdefine.org/out_of_the_clear_blue_sky/thesaurus/synonyms> |