Post books that are authoritative in your field and tech books you are reading.
Also reading this
I'll have to have a look at the 3rd edition sometime
>tfw you know C89 but no guis for applications programming
Heres a book thats authoritative in your field OP
I don't want to live on this planet anymore.
You could learn WinAPI/MFC, pretty sure they're all written in C. Alternatively, upgrade to C++ and pick up C++ GUI Programming with Qt4. 90% of the information still applies, and it's not a bad book.