| APA | Smart Define. (2011). life's duration thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/life%27s_duration/thesaurus/related |
| Chicago | Smart Define. 2011. "life's duration thesaurus" https://smartdefine.org/life%27s_duration/thesaurus/related (accessed September 30, 2026). |
| Harvard | Smart Define 2011, life's duration thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/life%27s_duration/thesaurus/related>. |
| MLA | Smart Define. "life's duration thesaurus" 23 May 2011. Web. 30 September 2026. <https://smartdefine.org/life%27s_duration/thesaurus/related> |