| APA | Smart Define. (2011). duck egg thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/duck_egg/thesaurus/antonyms |
| Chicago | Smart Define. 2011. "duck egg thesaurus" https://smartdefine.org/duck_egg/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2011, duck egg thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/duck_egg/thesaurus/antonyms>. |
| MLA | Smart Define. "duck egg thesaurus" 23 May 2011. Web. 24 September 2026. <https://smartdefine.org/duck_egg/thesaurus/antonyms> |