| APA | Smart Define. (1970). cenozoic erathem of europe thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/cenozoic_erathem_of_europe/thesaurus/narrower |
| Chicago | Smart Define. 1970. "cenozoic erathem of europe thesaurus" https://smartdefine.org/cenozoic_erathem_of_europe/thesaurus/narrower (accessed October 2, 2026). |
| Harvard | Smart Define 1970, cenozoic erathem of europe thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/cenozoic_erathem_of_europe/thesaurus/narrower>. |
| MLA | Smart Define. "cenozoic erathem of europe thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/cenozoic_erathem_of_europe/thesaurus/narrower> |