Perhaps the most valuable section for modern researchers is the exploration of the "post-modern" and "post-structural" turn.
If your professor specifically requires the 11th edition, you cannot use the 10th. However, if the syllabus lists "Ritzer, Sociological Theory (any recent edition)," the 9th or 10th edition PDFs are legally available via used book marketplaces for under $15. Ask your professor explicitly if edition matters. Many care about content (Weber, Marx, Durkheim) rather than the page number. sociological theory ritzer 11th edition pdf work
Using the search function in the PDF, pull every bolded term. Write them on index cards. Ritzer’s definitions are the gold standard for undergraduate comprehensive exams. Perhaps the most valuable section for modern researchers
Before discussing the PDF debate, it is critical to understand why the 11th edition (published by SAGE Publications) has become the standard text. Ritzer does not simply reprint old theories; he curates a living history of ideas. Ask your professor explicitly if edition matters