| APA | Smart Define. (-0001). International Earth Rotation and Reference Systems Service thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/international_earth_rotation_and_reference_systems_service/thesaurus/broader |
| Chicago | Smart Define. -0001. "International Earth Rotation and Reference Systems Service thesaurus" https://smartdefine.org/international_earth_rotation_and_reference_systems_service/thesaurus/broader (accessed September 25, 2026). |
| Harvard | Smart Define -0001, International Earth Rotation and Reference Systems Service thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/international_earth_rotation_and_reference_systems_service/thesaurus/broader>. |
| MLA | Smart Define. "International Earth Rotation and Reference Systems Service thesaurus" 30 November -0001. Web. 25 September 2026. <https://smartdefine.org/international_earth_rotation_and_reference_systems_service/thesaurus/broader> |