Here are a few in no particular order: 1. Expert .NET 2.0 IL Assembler (ISBN 1590596463) 2. Advanced Windows Debugging (ISBN 0321374460) 3. Advanced .NET Deb

Here are a few in no particular order: 1. Expert .NET 2.0 IL Assembler (ISBN 1590596463) 2. Advanced Windows Debugging (ISBN 0321374460) 3. Advanced .NET Debugging (ISBN 0321578899) 4. .NET Framework reference source code (https://referencesource.microsoft.com/ https://referencesource.microsoft.com/) 5. CoreCLR source code (https://github.com/dotnet/coreclr https://github.com/dotnet/coreclr) 6. MSDN documentation (it's not perfect, but it's not all bad) Before CoreCLR was open source, I had to rely on Shared Source Common Language Infrastructure (https://en.wikipedia.org/wiki/Shared_Source_Common_Language_Infrastructure https://en.wikipedia.org/wiki/Shared_Source_Common_Language_...).