Locating the books you need, once you have discovered their existence by doing a preliminary bibliography, is usually fairly simple. Either they are on the shelves at the library, or they are available through interlibrary loan. In the most highly regarded journals, the articles are frequently written by leading experts in the field. In literary studies, the use of both books and scholarly journals is essential. Reliance upon one over the other will produce an incomplete understanding of your topic.
Articles are obviously shorter than books, and their theses necessarily narrower.
Therefore, you are most likely to make satisfying progress in your own research by reading many of the relevant articles you will find in literary critical journals. You do this much the same way as you look for a book. Consult the library catalog to see if the library subscribes to the journal in question. If so, it will have a call number and you can find it on the shelf. If the library does not subscribe to this journal, copies of articles are usually available through interlibrary loan.