| APA | Smart Define. (2016). end of the world thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/end_of_the_world/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "end of the world thesaurus" https://smartdefine.org/end_of_the_world/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, end of the world thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/end_of_the_world/thesaurus/synonyms>. |
| MLA | Smart Define. "end of the world thesaurus" 14 February 2016. Web. 28 September 2026. <https://smartdefine.org/end_of_the_world/thesaurus/synonyms> |