| APA | Smart Define. (1970). landmark event thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/landmark_event/thesaurus/related |
| Chicago | Smart Define. 1970. "landmark event thesaurus" https://smartdefine.org/landmark_event/thesaurus/related (accessed September 26, 2026). |
| Harvard | Smart Define 1970, landmark event thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/landmark_event/thesaurus/related>. |
| MLA | Smart Define. "landmark event thesaurus" 1 January 1970. Web. 26 September 2026. <https://smartdefine.org/landmark_event/thesaurus/related> |