| APA | Smart Define. (2015). gross national product thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/gross_national_product/thesaurus/narrower |
| Chicago | Smart Define. 2015. "gross national product thesaurus" https://smartdefine.org/gross_national_product/thesaurus/narrower (accessed October 1, 2026). |
| Harvard | Smart Define 2015, gross national product thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/gross_national_product/thesaurus/narrower>. |
| MLA | Smart Define. "gross national product thesaurus" 13 April 2015. Web. 1 October 2026. <https://smartdefine.org/gross_national_product/thesaurus/narrower> |