| APA | Smart Define. (-0001). planetary protection thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/planetary_protection/thesaurus/broader |
| Chicago | Smart Define. -0001. "planetary protection thesaurus" https://smartdefine.org/planetary_protection/thesaurus/broader (accessed September 21, 2026). |
| Harvard | Smart Define -0001, planetary protection thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/planetary_protection/thesaurus/broader>. |
| MLA | Smart Define. "planetary protection thesaurus" 30 November -0001. Web. 21 September 2026. <https://smartdefine.org/planetary_protection/thesaurus/broader> |