For Books and Articles:
1. Check Knox Primo for availability; for articles type in the title of the article in the search box
2. If not available at Knox, search Knox Primo under "All I-Share Libraries"
3. If not available via I-Share, use the Tipasa interlibrary loan service.
Look at the bibliographies, footnotes and reference lists in the articles, books, and reference sources you have already found!
These will lead you to other relevant sources, both secondary and primary sources. Then, search for the article or book in Knox Primo to see if it is available. Use Tipasa to obtain articles not available in full text in Knox Primo.