In the catalog, use Historiography as a search term and limit to books and ebooks.
In article databases, you can also use Historiograph* as a search term"
You can also find historiographical essays in recent dissertations. When dissertations are published as academic monographs, these sections are usually cut by editors, so these sections can be extremely helpful.
For this class, though, I would avoid dissertations.
You'll often find that there are Not full historiography essays on your specific topic, so you'll need to use the short lit reviews that are included in every academic article. You'll need to write the historiographic summary of the fields yourselves!