Write an essay by John M. Cooper’s article, “Friendship and The Good In Aristotle” John M. Cooper’s article, “Friendship and The Good In Aristotle” who talks about a philosophers work namely Aristotle

i. have a question:
am currently working on an essay by John M. Cooper’s article, “Friendship and The Good In Aristotle” John M. Cooper’s article, “Friendship and The Good In Aristotle” who talks about a philosophers work namely Aristotle so was wondering when i do my in text citation should i use copper or Aristotle to mention