| APA | Smart Define. (1970). normal operation earthquake thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/normal_operation_earthquake/thesaurus/broader |
| Chicago | Smart Define. 1970. "normal operation earthquake thesaurus" https://smartdefine.org/normal_operation_earthquake/thesaurus/broader (accessed September 21, 2026). |
| Harvard | Smart Define 1970, normal operation earthquake thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/normal_operation_earthquake/thesaurus/broader>. |
| MLA | Smart Define. "normal operation earthquake thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/normal_operation_earthquake/thesaurus/broader> |