| APA | Smart Define. (2011). air transportation system thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/air_transportation_system/thesaurus/broader |
| Chicago | Smart Define. 2011. "air transportation system thesaurus" https://smartdefine.org/air_transportation_system/thesaurus/broader (accessed September 25, 2026). |
| Harvard | Smart Define 2011, air transportation system thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/air_transportation_system/thesaurus/broader>. |
| MLA | Smart Define. "air transportation system thesaurus" 26 April 2011. Web. 25 September 2026. <https://smartdefine.org/air_transportation_system/thesaurus/broader> |