| APA | Smart Define. (2011). a cappella choir thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/a_cappella_choir/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "a cappella choir thesaurus" https://smartdefine.org/a_cappella_choir/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2011, a cappella choir thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/a_cappella_choir/thesaurus/synonyms>. |
| MLA | Smart Define. "a cappella choir thesaurus" 23 May 2011. Web. 20 September 2026. <https://smartdefine.org/a_cappella_choir/thesaurus/synonyms> |