| APA | Smart Define. (2013). interplanetary space thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/interplanetary_space/thesaurus/broader |
| Chicago | Smart Define. 2013. "interplanetary space thesaurus" https://smartdefine.org/interplanetary_space/thesaurus/broader (accessed September 22, 2026). |
| Harvard | Smart Define 2013, interplanetary space thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/interplanetary_space/thesaurus/broader>. |
| MLA | Smart Define. "interplanetary space thesaurus" 19 May 2013. Web. 22 September 2026. <https://smartdefine.org/interplanetary_space/thesaurus/broader> |