| APA | Smart Define. (2015). headfirst thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/headfirst/thesaurus/related |
| Chicago | Smart Define. 2015. "headfirst thesaurus" https://smartdefine.org/headfirst/thesaurus/related (accessed September 20, 2026). |
| Harvard | Smart Define 2015, headfirst thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/headfirst/thesaurus/related>. |
| MLA | Smart Define. "headfirst thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/headfirst/thesaurus/related> |