| APA | Smart Define. (2013). Euphrasia officinalis thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/euphrasia_officinalis/thesaurus/synonyms |
| Chicago | Smart Define. 2013. "Euphrasia officinalis thesaurus" https://smartdefine.org/euphrasia_officinalis/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2013, Euphrasia officinalis thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/euphrasia_officinalis/thesaurus/synonyms>. |
| MLA | Smart Define. "Euphrasia officinalis thesaurus" 18 May 2013. Web. 24 September 2026. <https://smartdefine.org/euphrasia_officinalis/thesaurus/synonyms> |