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APASmart Define. (2015). regrettably thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/regrettably/thesaurus/related
ChicagoSmart Define. 2015. "regrettably thesaurus" https://smartdefine.org/regrettably/thesaurus/related (accessed September 24, 2026).
HarvardSmart Define 2015, regrettably thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/regrettably/thesaurus/related>.
MLASmart Define. "regrettably thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/regrettably/thesaurus/related>