Apart from these excellent notes, there are many C books to choose from. Try to browse a few in your library or bookshop before buying one. Consider the following when selecting a book:
These are two books which I have found very useful.
The C Programming Language
By: Brian W. Kernighan, Dennis M. Ritchie
Publishers: Prentice Hall
This book, by the authors of C and the original UNIX system, gives a full and economical description of the language. It is not cluttered with trivial examples, so will not suit the novice programmer. This book is regarded by many as the `standard' work on the C language.
A Book on C
By: Al Kelley, Ira Pohl
Publishers: Benjamin Cummings
This book gives a good description of C and the UNIX environment. Its style is more tutorial than Kernighan and Ritchie, so it would make a better purchase for the less experienced programmer. Newcomers to programming will find the plentiful examples helpful.