| APA | Smart Define. (2013). respiratory tract infection thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/respiratory_tract_infection/thesaurus/narrower |
| Chicago | Smart Define. 2013. "respiratory tract infection thesaurus" https://smartdefine.org/respiratory_tract_infection/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 2013, respiratory tract infection thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/respiratory_tract_infection/thesaurus/narrower>. |
| MLA | Smart Define. "respiratory tract infection thesaurus" 18 May 2013. Web. 1 October 2026. <https://smartdefine.org/respiratory_tract_infection/thesaurus/narrower> |