| APA | Smart Define. (2011). sign of things to come thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/sign_of_things_to_come/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "sign of things to come thesaurus" https://smartdefine.org/sign_of_things_to_come/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2011, sign of things to come thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/sign_of_things_to_come/thesaurus/synonyms>. |
| MLA | Smart Define. "sign of things to come thesaurus" 24 May 2011. Web. 1 October 2026. <https://smartdefine.org/sign_of_things_to_come/thesaurus/synonyms> |