| APA | Smart Define. (2011). digitalis purpurea thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/digitalis_purpurea/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "digitalis purpurea thesaurus" https://smartdefine.org/digitalis_purpurea/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2011, digitalis purpurea thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/digitalis_purpurea/thesaurus/synonyms>. |
| MLA | Smart Define. "digitalis purpurea thesaurus" 26 April 2011. Web. 23 September 2026. <https://smartdefine.org/digitalis_purpurea/thesaurus/synonyms> |