| APA | Smart Define. (2013). life span thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/life_span/thesaurus/related |
| Chicago | Smart Define. 2013. "life span thesaurus" https://smartdefine.org/life_span/thesaurus/related (accessed September 26, 2026). |
| Harvard | Smart Define 2013, life span thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/life_span/thesaurus/related>. |
| MLA | Smart Define. "life span thesaurus" 28 June 2013. Web. 26 September 2026. <https://smartdefine.org/life_span/thesaurus/related> |