| APA | Smart Define. (2013). breathing machine thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/breathing_machine/thesaurus/narrower |
| Chicago | Smart Define. 2013. "breathing machine thesaurus" https://smartdefine.org/breathing_machine/thesaurus/narrower (accessed September 21, 2026). |
| Harvard | Smart Define 2013, breathing machine thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/breathing_machine/thesaurus/narrower>. |
| MLA | Smart Define. "breathing machine thesaurus" 19 May 2013. Web. 21 September 2026. <https://smartdefine.org/breathing_machine/thesaurus/narrower> |