| APA | Smart Define. (2016). extraterrestrial thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/extraterrestrial/thesaurus/related |
| Chicago | Smart Define. 2016. "extraterrestrial thesaurus" https://smartdefine.org/extraterrestrial/thesaurus/related (accessed September 30, 2026). |
| Harvard | Smart Define 2016, extraterrestrial thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/extraterrestrial/thesaurus/related>. |
| MLA | Smart Define. "extraterrestrial thesaurus" 15 March 2016. Web. 30 September 2026. <https://smartdefine.org/extraterrestrial/thesaurus/related> |