Operating Systems, End of Semester Research Project: GNU/Linux

I've started gathering and studying information for my Operating Systems research project, where I am supposed to write about a particular operating system's design/architecture, including process and thread management, memory administration, processor administration, etc. I chose to GNU/Linux as my operating system.

Here's a list of online sources of information I've gathered so far:

• Introduction to Linux
• Understanding the Linux Kernel, 3rd Edition
• The Linux System Administrator's Guide
• History of Linux, in Git Repository Format
• Understanding the Linux Virtual Memory Manager
• Linux.com
• More resources (1)
• More resources (2)

If anybody reads this, and has an idea of where I can look for more information on the subject, I would appreciate you shared it with me. :)

Note: I will probably write this in Spanish. I just have that habit of writing in English sometimes.