| APA | Smart Define. (2011). in the centre thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/in_the_centre/thesaurus/narrower |
| Chicago | Smart Define. 2011. "in the centre thesaurus" https://smartdefine.org/in_the_centre/thesaurus/narrower (accessed September 23, 2026). |
| Harvard | Smart Define 2011, in the centre thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/in_the_centre/thesaurus/narrower>. |
| MLA | Smart Define. "in the centre thesaurus" 1 May 2011. Web. 23 September 2026. <https://smartdefine.org/in_the_centre/thesaurus/narrower> |