‘Mathematics Enhancement Programme’. n.d. http://www.cimt.org.uk/projects/mepres/alevel/alevel.htm.
Strait, Peggy Tang. 1989. A First Course in Probability and Statistics with Applications. 2nd ed. Harcourt Brace.
Wackerly, Dennis D., Richard L. Scheaffer, and William Mendenhall. 2008. Mathematical Statistics with Applications. 7th ed (int. student ed.). Thomson/Brooks/Cole.
Weiss, N. A. 1997. Introductory Statistics. 4th alternate ed. Addison-Wesley Pub. Co.
Weiss, N. A., Paul T. Holmes, and Michael Hardy. 2006. A Course in Probability. Pearson Addison Wesley.