Mass media communication – press (newspapers, ads, TV, radio, films, etc.)
Books, Internet, peer-reviewed journals, government publications
Professional periodicals like College English Language Teaching Forum, English Forum, the Economist, Academia, Business Circle, Law Review, etc.
General periodicals such as Readers' Digest, Women's Magazine, Panorama Magazine, Time Magazine, World Mission Magazine, etc.
Previous reading assignments in your other subjects
Work experience – clues to a researchable topic from full-time or part-time jobs, OJT (on-the-job training) experience, fieldwork, etc.