| APA | Smart Define. (2016). opinion thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/opinion/thesaurus/narrower |
| Chicago | Smart Define. 2016. "opinion thesaurus" https://smartdefine.org/opinion/thesaurus/narrower (accessed September 25, 2026). |
| Harvard | Smart Define 2016, opinion thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/opinion/thesaurus/narrower>. |
| MLA | Smart Define. "opinion thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/opinion/thesaurus/narrower> |