| APA | Smart Define. (2013). upper case letter thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/upper_case_letter/thesaurus/related |
| Chicago | Smart Define. 2013. "upper case letter thesaurus" https://smartdefine.org/upper_case_letter/thesaurus/related (accessed September 23, 2026). |
| Harvard | Smart Define 2013, upper case letter thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/upper_case_letter/thesaurus/related>. |
| MLA | Smart Define. "upper case letter thesaurus" 17 May 2013. Web. 23 September 2026. <https://smartdefine.org/upper_case_letter/thesaurus/related> |