Schaefer, R. T. (1998). Sociology. McGraw-Hill.
Cita Chicago (17th ed.)Schaefer, Richard T. Sociology. New York: McGraw-Hill, 1998.
Cita MLA (9th ed.)Schaefer, Richard T. Sociology. McGraw-Hill, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.