"OK, adj., int.1, n.2, and adv." OED Online. Oxford University Press, March 2021. Web. 21 April 2021.

"OK, adj., int.1, n.2, and adv." OED Online, Oxford University Press, March 2021, www.oed.com/viewdictionaryentry/Entry/130925. Accessed 21 April 2021.

"OK, adj., int.1, n.2, and adv.". OED Online. March 2021. Oxford University Press. https://www.oed.com/viewdictionaryentry/Entry/130925 (accessed April 21, 2021).