A good place to start is the two volume Histoire du Structuralisme (1991/2) by F. Dosse: it provides a context and a few chapters on Foucault in both books. In the late 70's quite a few people claimed to have always been "post-structuralists" but many of them, including Foucault, earlier were just "structuralists", a rather laudatory or at least fashionable description at that time. So in older and even (out)dated writings connecting Foucault to structuralism is better evidenced; there is a 3pages double column bibliography from 73 by Lapointe. An interesting paper by Allan Megill from 1979:
[But] the passage from archaeology to genealogy was delayed, I shall
argue, by his traversal of structuralism-a traversal that obscured,
both for him and for us, the true nature of his historical vocation.
The conflict, in the interior of the Foucaultian text, between
structuralism and antistructuralism, between Apollo and Dionysos,
even-if one will-between Plato and Nietzsche, has from all points of
view been the most interesting and most revealing theme in Foucault's
work to date. It is, furthermore, a theme that we must grasp if we are
to understand the changing presuppositions that have underlain
Foucault' s various historical writings
Dosse F., History of Structuralism, Minnesota UP (1998)
Lapointe (1973) Michel Foucault. A Bibliographic Essay, J. of
the British Society for Phenomenology, 4:2, 195-7
Megill A, Foucault, Structuralism, and the Ends of History,
J. of Modern History, Vol. 51, No. 3 (Sep., 1979), pp. 451-503