| APA | Smart Define. (2013). speed of light thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/speed_of_light/thesaurus/broader |
| Chicago | Smart Define. 2013. "speed of light thesaurus" https://smartdefine.org/speed_of_light/thesaurus/broader (accessed September 22, 2026). |
| Harvard | Smart Define 2013, speed of light thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/speed_of_light/thesaurus/broader>. |
| MLA | Smart Define. "speed of light thesaurus" 18 May 2013. Web. 22 September 2026. <https://smartdefine.org/speed_of_light/thesaurus/broader> |