| APA | Smart Define. (1970). area fifty one thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/area_fifty_one/thesaurus/synonyms |
| Chicago | Smart Define. 1970. "area fifty one thesaurus" https://smartdefine.org/area_fifty_one/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 1970, area fifty one thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/area_fifty_one/thesaurus/synonyms>. |
| MLA | Smart Define. "area fifty one thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/area_fifty_one/thesaurus/synonyms> |