1. An Introduction to Probability Theory and its Applications, Vol. 1;Feller,1968
2. An Introduction to Probability Theory and its Applications, Vol. 2;Feller,1971
3. Théorie de l’Addition des Variables Aléatoires;Lévy,1954
4. Limit Distributions for Sums of Independent Random Variables;Gnedenko,1954
5. Independent and Stationary Sequences of Random Variables;Ibragimov,1971