Lundberg, G. A. (1953). Social research: A study methods of gathering data (2nd ed.). Longmans, Green and Co..
Cita Chicago (17th ed.)Lundberg, George A. Social Research: A Study Methods of Gathering Data. 2nd ed. New York, N.Y.: Longmans, Green and Co., 1953.
Cita MLA (8th ed.)Lundberg, George A. Social Research: A Study Methods of Gathering Data. 2nd ed. Longmans, Green and Co., 1953.
Atenció: Aquestes cites poden no estar 100% correctes.