| APA | Smart Define. (2011). single-rotor helicopter thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/single-rotor_helicopter/thesaurus/broader |
| Chicago | Smart Define. 2011. "single-rotor helicopter thesaurus" https://smartdefine.org/single-rotor_helicopter/thesaurus/broader (accessed September 22, 2026). |
| Harvard | Smart Define 2011, single-rotor helicopter thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/single-rotor_helicopter/thesaurus/broader>. |
| MLA | Smart Define. "single-rotor helicopter thesaurus" 26 April 2011. Web. 22 September 2026. <https://smartdefine.org/single-rotor_helicopter/thesaurus/broader> |