| APA | Smart Define. (1970). took sabbatical to concentrate on book thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/took_sabbatical_to_concentrate_on_book/thesaurus/broader |
| Chicago | Smart Define. 1970. "took sabbatical to concentrate on book thesaurus" https://smartdefine.org/took_sabbatical_to_concentrate_on_book/thesaurus/broader (accessed September 29, 2026). |
| Harvard | Smart Define 1970, took sabbatical to concentrate on book thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/took_sabbatical_to_concentrate_on_book/thesaurus/broader>. |
| MLA | Smart Define. "took sabbatical to concentrate on book thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/took_sabbatical_to_concentrate_on_book/thesaurus/broader> |