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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.