| APA | Smart Define. (1970). systems of information exchange thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/systems_of_information_exchange/thesaurus/narrower |
| Chicago | Smart Define. 1970. "systems of information exchange thesaurus" https://smartdefine.org/systems_of_information_exchange/thesaurus/narrower (accessed September 25, 2026). |
| Harvard | Smart Define 1970, systems of information exchange thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/systems_of_information_exchange/thesaurus/narrower>. |
| MLA | Smart Define. "systems of information exchange thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/systems_of_information_exchange/thesaurus/narrower> |