| APA | Smart Define. (2013). oral poliovirus vaccine thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/oral_poliovirus_vaccine/thesaurus/broader |
| Chicago | Smart Define. 2013. "oral poliovirus vaccine thesaurus" https://smartdefine.org/oral_poliovirus_vaccine/thesaurus/broader (accessed October 2, 2026). |
| Harvard | Smart Define 2013, oral poliovirus vaccine thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/oral_poliovirus_vaccine/thesaurus/broader>. |
| MLA | Smart Define. "oral poliovirus vaccine thesaurus" 19 May 2013. Web. 2 October 2026. <https://smartdefine.org/oral_poliovirus_vaccine/thesaurus/broader> |