| APA | Smart Define. (2011). unexpected occurrence thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unexpected_occurrence/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "unexpected occurrence thesaurus" https://smartdefine.org/unexpected_occurrence/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2011, unexpected occurrence thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unexpected_occurrence/thesaurus/synonyms>. |
| MLA | Smart Define. "unexpected occurrence thesaurus" 29 May 2011. Web. 21 September 2026. <https://smartdefine.org/unexpected_occurrence/thesaurus/synonyms> |