APA (7th ed.) Citation

Rex, J. (1961). Key problems of sociological theory. Routldge and K. Paul.

Chicago Style (17th ed.) Citation

Rex, John. Key Problems of Sociological Theory. London, England: Routldge and K. Paul, 1961.

MLA (9th ed.) Citation

Rex, John. Key Problems of Sociological Theory. Routldge and K. Paul, 1961.