Beck, M., H. Boehme, M. Dziadzka, U. Kunitz, R. Magnus, C. Schroter, and D. Verworner. Linux Kernel Programming (3rd ed.). Addison Wesley, 2002. A hardware-independent book covering the Linux 2.4 kernel.
Maxwell, S. Linux Core Kernel Commentary. The Coriolis Group, LLC, 1999. A listing of part of the Linux kernel source code with some interesting comments at the end of the book.
Mosberger, D., S. Eranian, and B. Perens. IA-64 Linux Kernel: Design and Implementation. Prentice Hall, Inc., 2002. An excellent description of the hardware-dependent Linux kernel for the Itanium IA-64 microprocessor.
Rubini, A., J. Corbet. Linux Device Drivers (2nd ed.). O’Reilly & Associates, Inc., 2001. A valuable book that is somewhat complementary to this one. It gives plenty of information on how to develop drivers for Linux.
Satchell S., H. Clifford. Linux IP Stacks Commentary. The Coriolis Group, LLC, 2000. A listing of part of the Linux kernel networking source code with some comments at the end of the book.