| APA | Smart Define. (2013). space biology thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/space_biology/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "space biology thesaurus" https://smartdefine.org/space_biology/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2013, space biology thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/space_biology/thesaurus/synonyms>. |
| MLA | Smart Define. "space biology thesaurus" 18 May 2013. Web. 30 September 2026. <https://smartdefine.org/space_biology/thesaurus/synonyms> |