Pinsky, M.A. and Karlin, S. (2011) An introduction to stochastic modeling. 4th ed. Amsterdam: Academic Press.
Ross, S.M. and MyiLibrary (2007) Introduction to probability models. 9th ed. Amsterdam: Academic Press. Available at: http://catalogue.library.qmul.ac.uk/uhtbin/ezproxy.pl?url=http://lib.myilibrary.com?id=74703.