| APA | Smart Define. (2016). change over a period of time thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/change_over_a_period_of_time/thesaurus/narrower |
| Chicago | Smart Define. 2016. "change over a period of time thesaurus" https://smartdefine.org/change_over_a_period_of_time/thesaurus/narrower (accessed September 30, 2026). |
| Harvard | Smart Define 2016, change over a period of time thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/change_over_a_period_of_time/thesaurus/narrower>. |
| MLA | Smart Define. "change over a period of time thesaurus" 14 March 2016. Web. 30 September 2026. <https://smartdefine.org/change_over_a_period_of_time/thesaurus/narrower> |