Beginning Linux Programming
Neil Matthew, Richard Stones / Wrox Pr Inc / September 1996

Inside Linux: A Look at Operating System Development
Randolph Bentson / Specialized Systems Consultants / March 1996

Linux Kernel Internals
Beck, Bohme, Dziadzka, Kunitz, Magnus / Addison-Wesley / September 1996

Linux Programming
Volkerding, Johnson, Reichard / M & T Books / January 1997