| APA | Smart Define. (2015). passive immunity thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/passive_immunity/thesaurus/broader |
| Chicago | Smart Define. 2015. "passive immunity thesaurus" https://smartdefine.org/passive_immunity/thesaurus/broader (accessed September 23, 2026). |
| Harvard | Smart Define 2015, passive immunity thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/passive_immunity/thesaurus/broader>. |
| MLA | Smart Define. "passive immunity thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/passive_immunity/thesaurus/broader> |