| APA | Smart Define. (2011). capital of the united states thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/capital_of_the_united_states/thesaurus/narrower |
| Chicago | Smart Define. 2011. "capital of the united states thesaurus" https://smartdefine.org/capital_of_the_united_states/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 2011, capital of the united states thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/capital_of_the_united_states/thesaurus/narrower>. |
| MLA | Smart Define. "capital of the united states thesaurus" 26 April 2011. Web. 1 October 2026. <https://smartdefine.org/capital_of_the_united_states/thesaurus/narrower> |