| APA | Smart Define. (2011). sir ralph david richardson thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/sir_ralph_david_richardson/thesaurus/broader |
| Chicago | Smart Define. 2011. "sir ralph david richardson thesaurus" https://smartdefine.org/sir_ralph_david_richardson/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define 2011, sir ralph david richardson thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/sir_ralph_david_richardson/thesaurus/broader>. |
| MLA | Smart Define. "sir ralph david richardson thesaurus" 26 April 2011. Web. 29 September 2026. <https://smartdefine.org/sir_ralph_david_richardson/thesaurus/broader> |