APA
Spiegel M. R., . (1961). Theory and problems of statistics. New York: Schaum Publishing Company.
Chicago
Spiegel Murray R, . 1961. Theory and problems of statistics. New York: Schaum Publishing Company.
Harvard
Spiegel M. R., . (1961). Theory and problems of statistics. New York: Schaum Publishing Company.
MLA
Spiegel Murray R, . Theory and problems of statistics. New York: Schaum Publishing Company. 1961.