| APA | Smart Define. (2011). unfathomable cavity thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unfathomable_cavity/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "unfathomable cavity thesaurus" https://smartdefine.org/unfathomable_cavity/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2011, unfathomable cavity thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unfathomable_cavity/thesaurus/synonyms>. |
| MLA | Smart Define. "unfathomable cavity thesaurus" 29 May 2011. Web. 25 September 2026. <https://smartdefine.org/unfathomable_cavity/thesaurus/synonyms> |