| APA | Smart Define. (2013). birdsong thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/birdsong/thesaurus/related |
| Chicago | Smart Define. 2013. "birdsong thesaurus" https://smartdefine.org/birdsong/thesaurus/related (accessed September 29, 2026). |
| Harvard | Smart Define 2013, birdsong thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/birdsong/thesaurus/related>. |
| MLA | Smart Define. "birdsong thesaurus" 17 June 2013. Web. 29 September 2026. <https://smartdefine.org/birdsong/thesaurus/related> |