| APA | Smart Define. (2015). youthfulness thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/youthfulness/thesaurus/related |
| Chicago | Smart Define. 2015. "youthfulness thesaurus" https://smartdefine.org/youthfulness/thesaurus/related (accessed October 2, 2026). |
| Harvard | Smart Define 2015, youthfulness thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/youthfulness/thesaurus/related>. |
| MLA | Smart Define. "youthfulness thesaurus" 10 April 2015. Web. 2 October 2026. <https://smartdefine.org/youthfulness/thesaurus/related> |