| APA | Smart Define. (2016). pie in the sky thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/pie_in_the_sky/thesaurus/narrower |
| Chicago | Smart Define. 2016. "pie in the sky thesaurus" https://smartdefine.org/pie_in_the_sky/thesaurus/narrower (accessed September 28, 2026). |
| Harvard | Smart Define 2016, pie in the sky thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/pie_in_the_sky/thesaurus/narrower>. |
| MLA | Smart Define. "pie in the sky thesaurus" 25 February 2016. Web. 28 September 2026. <https://smartdefine.org/pie_in_the_sky/thesaurus/narrower> |