(third-person singular simple present books up, present participle booking up, simple past and past participle booked up)
"book-up." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/book-up>.
book-up. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/book-up
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