| APA | Smart Define. (2011). holy roman emperor thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/holy_roman_emperor/thesaurus/narrower |
| Chicago | Smart Define. 2011. "holy roman emperor thesaurus" https://smartdefine.org/holy_roman_emperor/thesaurus/narrower (accessed September 30, 2026). |
| Harvard | Smart Define 2011, holy roman emperor thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/holy_roman_emperor/thesaurus/narrower>. |
| MLA | Smart Define. "holy roman emperor thesaurus" 26 April 2011. Web. 30 September 2026. <https://smartdefine.org/holy_roman_emperor/thesaurus/narrower> |