Observation in Plato’s Astronomy
I am attaching a final paper that I have recently written. While I will not name the professor or the course, it should be pretty easy to guess with a bit of investigation.
At any rate, this paper is something of a literature review focused on Republic 527d-530c. Readings of Plato's astronomy by Vlastos, Mourelatos, and Gregory are examined both for internal consistency and accuracy with the text.

How do I reference that paper? Has it been published yet? If so, where?
The paper has not been published, so a proper citation would be something like:
Steinert-Threlkeld, Shane. "Observation in Plato's Astronomy." Unpublished manuscript. Accessed dd/mm/yy, URL.