Foucault, Michel. 1979. “Authorship: What Is an Author?” Screen 20 (1): 13–34. doi:10.1093/screen/20.1.13.
Really interesting and far ranging essay about authorship. Shows how literary authorship is really a function: i.e. a thing we use to capture assumptions about ethical background to an oeuvre. Makes a number of useful distinctions among genres and the like in this regard,
A very interesting discussion has to do with "initiators of discursive practices," which are in a certain sense the Humanities equivalent of Kuhn's paradigm shifters. He argues though, that people like Freud and Marx establish practices to which we "return," rather than disciplines that we refine (as he argues they do in science). This is not 100% true, in the sense that evolution is a theory in the Freudian sense, especially when it manifests itself as evolutionary psychology. But it is largely true, in the sense that there is less to be gained in rereading Galileo than in rereading Freud. (Although these line up roughly on a humanities/science division, it isn't 100%: I'd argue that oral formulaicism is more like Galileo than Freud, for example, while Darwin is more like Freud).
An interesting companion to this is Fish 1988, where he argues against blind peer review in the humanities. He uses examples of other discourse initiators, like Frye, for example, to argue that their opinions are more important than others because of who they are.
In my own notes, thinking about the article on scientific authorship, I developed the idea of Oeuvre as a key distinction between this kind of authorship and scientific authorship.