Textbooks:

Quantum Field Theory, by F. Mandl and G. Shaw (Wiley, 1999)

Quantum Theory of Many-Particle Systems, by A.L. Fetter and J.D. Walecka (Dover, 2003)

Some other good books:

Advanced Quantum Mechanics, by J.J. Sakurai (Addison-Wesley, 1967)

An Introduction to Quantum Field Theory, by M.E. Peskin and D.V. Schroeder (Addison-Wesley, 1995).

Quantum Field Theory, by L.H. Ryder (Cambridge University Press, 1996)

The Quantum Theory of Fields, by S. Weinberg (Cambridge University Press, 1995-2002)

Gauge Theory of Elementary Particle Physics, by T.-P. Cheng and L.-F. Li (Oxford University Press, 1984)

Methods of Quantum Field Theory in Statistical Physics, by A.A. Abrikosov et al. (Dover, 1975)