| APA | Smart Define. (2013). natural glass thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/natural_glass/thesaurus/narrower |
| Chicago | Smart Define. 2013. "natural glass thesaurus" https://smartdefine.org/natural_glass/thesaurus/narrower (accessed September 28, 2026). |
| Harvard | Smart Define 2013, natural glass thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/natural_glass/thesaurus/narrower>. |
| MLA | Smart Define. "natural glass thesaurus" 18 May 2013. Web. 28 September 2026. <https://smartdefine.org/natural_glass/thesaurus/narrower> |