Get Help - Chat with a librarian or schedule an appointment
Think and read broadly about your topic anywhere you can, and consider what questions those sources provoke or leave unanswered. What do you want to know more about? What confuses/interests/annoys/endears you to this subject?
Try different search terms using synonyms (e.g., "working class" or "blue collar").
Approach your subject from different angles. Look at research sources & databases from different fields like sociology, gender studies, economics, communication, and more.
One you find a good book or article, look at the author, the subject links (in the database record), and the bibliography.
Keep a record of everything you find and where and how you find it.