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| APA | Smart Define. (2011). once-in-a-lifetime thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/once-in-a-lifetime/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "once-in-a-lifetime thesaurus" https://smartdefine.org/once-in-a-lifetime/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2011, once-in-a-lifetime thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/once-in-a-lifetime/thesaurus/synonyms>. |
| MLA | Smart Define. "once-in-a-lifetime thesaurus" 23 May 2011. Web. 1 October 2026. <https://smartdefine.org/once-in-a-lifetime/thesaurus/synonyms> |