Abbreviations
21st, 21st, XXI
twenty-first
English Wiktionary. Available under CC-BY-SA license.
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"twenty-first." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/twenty-first>.
APA Style
twenty-first. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/twenty-first
