Noun
- plural form of punch clock
punch-clocks
English Wiktionary. Available under CC-BY-SA license.
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"punch-clocks." YourDictionary, n.d. Web. 15 December 2018. <https://www.yourdictionary.com/punch-clocks>.
APA Style
punch-clocks. (n.d.). Retrieved December 15th, 2018, from https://www.yourdictionary.com/punch-clocks
