| APA | Smart Define. (2013). clapper valve thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/clapper_valve/thesaurus/related |
| Chicago | Smart Define. 2013. "clapper valve thesaurus" https://smartdefine.org/clapper_valve/thesaurus/related (accessed September 23, 2026). |
| Harvard | Smart Define 2013, clapper valve thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/clapper_valve/thesaurus/related>. |
| MLA | Smart Define. "clapper valve thesaurus" 17 May 2013. Web. 23 September 2026. <https://smartdefine.org/clapper_valve/thesaurus/related> |