The textbook: T. Cover and J. Thomas, Elements of Information Theory, 2nd Edition, 2006.
Sections of the additional books/papers:
A. El Gamal and Y-H. Kim, Network Information Theory, Cambridge University Press, 2012.
E. Arikan, “Channel Polarization: A Method for Constructing Capacity-Achieving Codes for Symmetric Binary-Input Memoryless Channels”, IEEE Trans. Information Theory, 2009.