H. Carmichael, `An Open System Approach to Quantum Optics', Springer Lecture Notes in Physics m 18, (Berlin, Heidelberg, 1993): good introduction into Master equations, quantum trajectories, quantum optics.
D. F. Walls and G. J. Milburn, `Quantum Optics', Springer (Berlin) 1994: quantum optics book; good reference book but very condensed.
U. Weiss, `Quantum Dissipative Systems', World Scientific (Singapore) (1993): advanced methods (path integral) beyond Master equation approach.
H. Haug and A.-P. Jauho, `Quantum Kinetics in Transport and Optics of Semiconductors', Springer 1996: non-equilibrium (Keldysh) Green's function approach.
F. Haake, `Quantum Signatures of Chaos', Springer (Berlin, Heidelberg) 2001: good chapter on dissipation.
A. J. Leggett, S. Chakravarty, A. T. Dorsey, M. P. A. Fisher, A. Garg, and W. Zwerger, Rev. Mod. Phys. 59, 1 (1987): famous review of dissipative two-level system.