Lerche, C. (1983). Social and economic statistics. Longman.
Cita Chicago (17th ed.)Lerche, C.O. Social and Economic Statistics. London: Longman, 1983.
Cita MLA (9th ed.)Lerche, C.O. Social and Economic Statistics. Longman, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.