CMOS Circuit Design, Layout, and Simulation [[3rd (third) Edition]] by R. Jacob Baker. Institute of Electrical and Electronics Engineers ,2011 3rd (third) Edition
Though it is a very good book I think if one wants specific knowledge of Layout in CMOS he can use Dan Clein's book,Analog layout Alan Hastings,for Modelling tsividis
One of the best books you can find on CMOS layout and design. Although, its approach is sometimes very simple, but the breadth of information and especially the information regarding the process and what really are the issues at that nano-scale level of the transistor, it has been an enlightening experience. This book is really vast in topics but when you are working on CMOS circuit design, gives a sense of completeness and leaves no gaps in between as most of the textbooks do.
Reading this book as part of my Final Year Project. Its quite a helpful book, though the approach is more numeric than theoretical. The book also has a second edition, something to do with Mixed-signal designing I guess.