Possible citation for this source, according to MLA style:
deLaplante, Kevin. "Avoiding Plagiarism: When Should I Cite a Source?" How to Cite Sources and Avoid Plagiarism, no. 8, 23 January 2013. YouTube, https://youtu.be/g-IrFdghs4w?list=PL32A9993FC82230C3.
Possible MLA citation for full playlist, where the playlist is like a book with chapters, and we are citing the "book."
deLaplante, Kevin. How to Cite Sources and Avoid Plagiarism. 24 June 2014. YouTube, https://www.youtube.com/playlist?list=PL32A9993FC82230C3
Possible MLA citation for a particular video in the playlist:
deLaplante, Kevin. "Avoiding Plagiarism: When Should I Cite a Source?" How to Cite Sources and Avoid Plagiarism, no. 8, 23 January 2013. YouTube, https://youtu.be/g-IrFdghs4w?list=PL32A9993FC82230C3.