| APA | Smart Define. (2011). rare item thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rare_item/thesaurus/narrower |
| Chicago | Smart Define. 2011. "rare item thesaurus" https://smartdefine.org/rare_item/thesaurus/narrower (accessed September 21, 2026). |
| Harvard | Smart Define 2011, rare item thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rare_item/thesaurus/narrower>. |
| MLA | Smart Define. "rare item thesaurus" 2 May 2011. Web. 21 September 2026. <https://smartdefine.org/rare_item/thesaurus/narrower> |