| APA | Smart Define. (1970). billon thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/billon/thesaurus/related |
| Chicago | Smart Define. 1970. "billon thesaurus" https://smartdefine.org/billon/thesaurus/related (accessed October 2, 2026). |
| Harvard | Smart Define 1970, billon thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/billon/thesaurus/related>. |
| MLA | Smart Define. "billon thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/billon/thesaurus/related> |