"OK, adj., int.1, n.2, and adv." OED Online. Oxford University Press, March 2020. Web. 27 May 2020.

"OK, adj., int.1, n.2, and adv." OED Online, Oxford University Press, March 2020, www.oed.com/viewdictionaryentry/Entry/130925. Accessed 27 May 2020.

"OK, adj., int.1, n.2, and adv.". OED Online. March 2020. Oxford University Press. https://www.oed.com/viewdictionaryentry/Entry/130925 (accessed May 27, 2020).