| APA | Smart Define. (2011). silly billy thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/silly_billy/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "silly billy thesaurus" https://smartdefine.org/silly_billy/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2011, silly billy thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/silly_billy/thesaurus/synonyms>. |
| MLA | Smart Define. "silly billy thesaurus" 29 May 2011. Web. 23 September 2026. <https://smartdefine.org/silly_billy/thesaurus/synonyms> |