| APA | Smart Define. (2011). clyde william tombaugh thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/clyde_william_tombaugh/thesaurus/broader |
| Chicago | Smart Define. 2011. "clyde william tombaugh thesaurus" https://smartdefine.org/clyde_william_tombaugh/thesaurus/broader (accessed September 28, 2026). |
| Harvard | Smart Define 2011, clyde william tombaugh thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/clyde_william_tombaugh/thesaurus/broader>. |
| MLA | Smart Define. "clyde william tombaugh thesaurus" 26 April 2011. Web. 28 September 2026. <https://smartdefine.org/clyde_william_tombaugh/thesaurus/broader> |