"mother, n.1 (and int.)." OED Online. Oxford University Press, September 2019. Web. 19 October 2019.

"mother, n.1 (and int.)." OED Online, Oxford University Press, September 2019, oed.com/viewdictionaryentry/Entry/122640. Accessed 19 October 2019.

"mother, n.1 (and int.)". OED Online. September 2019. Oxford University Press. https://oed.com/viewdictionaryentry/Entry/122640 (accessed October 19, 2019).