| APA | Smart Define. (2015). hollow and curved thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/hollow_and_curved/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hollow and curved thesaurus" https://smartdefine.org/hollow_and_curved/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2015, hollow and curved thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/hollow_and_curved/thesaurus/synonyms>. |
| MLA | Smart Define. "hollow and curved thesaurus" 10 April 2015. Web. 1 October 2026. <https://smartdefine.org/hollow_and_curved/thesaurus/synonyms> |