Singer, L. (1980). Sociology: A students introduction. University Press of America.
Cita Chicago (17th ed.)Singer, Lester. Sociology: A Students Introduction. University Press of America, 1980.
Cita MLA (9th ed.)Singer, Lester. Sociology: A Students Introduction. University Press of America, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.