Ask for help anytime but if it's after hours and you are stuck, here are some tips:
- Check the bibliograpies of your secondary sources (to find additional secondary as well as primary sources)
- Consult the handouts on the various tabs of this guide (lots of search tips)
- Try LibrarySearch and Worldcat (again) but try different combinations of terms and their synonyms. The sources you already found are good places to look for additional terms.
- Try Hathitrust - it gives you the benefit of searching the full-text of books and documents (includes many primary sources)
- Email your librarian / subject specialist and request a research consultation.
