| APA | Smart Define. (2011). factor of proportionality thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/factor_of_proportionality/thesaurus/narrower |
| Chicago | Smart Define. 2011. "factor of proportionality thesaurus" https://smartdefine.org/factor_of_proportionality/thesaurus/narrower (accessed September 20, 2026). |
| Harvard | Smart Define 2011, factor of proportionality thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/factor_of_proportionality/thesaurus/narrower>. |
| MLA | Smart Define. "factor of proportionality thesaurus" 26 April 2011. Web. 20 September 2026. <https://smartdefine.org/factor_of_proportionality/thesaurus/narrower> |