Spiegel, M. R. (1992). Theory and problems of statistics (2nd ed.). McGraw-Hill.
Cita Chicago (17th ed.)Spiegel, Murray R. Theory and Problems of Statistics. 2nd ed. New York: McGraw-Hill, 1992.
Cita MLA (9th ed.)Spiegel, Murray R. Theory and Problems of Statistics. 2nd ed. McGraw-Hill, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.