| APA | Smart Define. (-0001). spirit of the century thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/spirit_of_the_century/thesaurus/broader |
| Chicago | Smart Define. -0001. "spirit of the century thesaurus" https://smartdefine.org/spirit_of_the_century/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define -0001, spirit of the century thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/spirit_of_the_century/thesaurus/broader>. |
| MLA | Smart Define. "spirit of the century thesaurus" 30 November -0001. Web. 29 September 2026. <https://smartdefine.org/spirit_of_the_century/thesaurus/broader> |