REFERENCES
- Kai Lai Chung, Elementary Probability Theory with Stochastic Processes, Undergraduate Texts in Mathematics, Springer-Verlag, New York, 1974.
- William Feller, An Introduction to Probability Theory and Its Applications, Volume I, 3rd edition, John Wiley & Sons, New York, 1968.
- Paul G. Hoel, Sidney C Port, and Charles J. Stone, Introduction to Probability Theory, Houghton Mifflin, Boston, 1971.
- T. V. Narayana, Lattice Path Combinatorics with Statistical Applications, University of Toronto Press, Toronto, 1979.
- Frank Spitzer, Principles of Random Walk, Van Nostrand, 1964, and Springer-Verlag, New York, 1976.