Freund, John E., Irwin Miller, and Marylees Miller. 2004. John E. Freund’s Mathematical Statistics with Applications. 7th ed. Upper Saddle River, N.J.: Prentice Hall.
HOGG, ROBERT. TANIS, ELLIOT. n.d. PROBABILITY AND STATISTICAL INFERENCE, GLOBAL EDITION. PEARSON EDUCATION LIMITED.
Strait, Peggy Tang. 1989. A First Course in Probability and Statistics with Applications. 2nd ed. San Diego: Harcourt Brace.
Wackerly, Dennis D., Richard L. Scheaffer, and William Mendenhall. 2008. Mathematical Statistics with Applications. 7th ed (int. student ed.). London: Thomson/Brooks/Cole.
Weiss, N. A., Paul T. Holmes, and Michael Hardy. 2006. A Course in Probability. Boston: Pearson Addison Wesley.