Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries; Krzysztof Cwalina and Brad Abrams; ISBN 0-321-24675-6; Addison-Wesley, 2005.
.NET Framework Standard Annotated Reference, Volume 1: Base Class Library and Extended Numerics Library; Brad Abrams; ISBN 0-321-15489-4; Addison-Wesley, 2004.
.NET Framework Standard Annotated Reference, Volume 2: Networking Library, Reflection Library, and XML Library; Brad Abrams and Tamara Abrams; ISBN 0-321-19445-4; Addison-Wesley, 2005.
The Common Language Infrastructure Annotated Standard; James S. Miller and Susann Ragsdale; ISBN 0-321-15493-2; Addison-Wesley, 2003.
The C# Programming Language; Anders Hejlsberg, Scott Wiltamuth and Peter Golde; ISBN 0-321-15491-6; Addison-Wesley, 2003.
"CLR Inside Out: Base Class Library Tips and Tricks"; Kit George; MSDN Magazine, January 2006; http://msdn.microsoft.com/msdnmag/issues/06/01/CLRInsideOut.
New Recommendations for Using Strings in .NET 2.0; Dave Fetterman; 2005; http://msdn.microsoft.com/library/en-us/dndotnet/html/StringsinNET20.asp.