| APA | Smart Define. (2016). air travel thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/air_travel/thesaurus/narrower |
| Chicago | Smart Define. 2016. "air travel thesaurus" https://smartdefine.org/air_travel/thesaurus/narrower (accessed September 30, 2026). |
| Harvard | Smart Define 2016, air travel thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/air_travel/thesaurus/narrower>. |
| MLA | Smart Define. "air travel thesaurus" 29 March 2016. Web. 30 September 2026. <https://smartdefine.org/air_travel/thesaurus/narrower> |