| APA | Smart Define. (2011). ernestine schumann-heink thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/ernestine_schumann-heink/thesaurus/broader |
| Chicago | Smart Define. 2011. "ernestine schumann-heink thesaurus" https://smartdefine.org/ernestine_schumann-heink/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define 2011, ernestine schumann-heink thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/ernestine_schumann-heink/thesaurus/broader>. |
| MLA | Smart Define. "ernestine schumann-heink thesaurus" 26 April 2011. Web. 29 September 2026. <https://smartdefine.org/ernestine_schumann-heink/thesaurus/broader> |