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APASmart Define. (2015). not compulsory thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/not_compulsory/thesaurus/antonyms
ChicagoSmart Define. 2015. "not compulsory thesaurus" https://smartdefine.org/not_compulsory/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, not compulsory thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/not_compulsory/thesaurus/antonyms>.
MLASmart Define. "not compulsory thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/not_compulsory/thesaurus/antonyms>