[1] Bluefire os. Website http://code.google.com/p/blue-fire-os/
[2] Dietlibc c library. Website http://www.fefe.de/dietlibc/
[3] Indiana university knowledge base. Website http://kb.iu.edu/data/akqn.html
[4] Linux kernel version 0.01. Website https://www.kernel.org/pub/linux/kernel/Historic/
[5] MINIX 3 official. Website http://www.minix3.org
[6] Mit’s xv6 operating system course. Website.
[7] Picoc small c interpreter. Website http://code.google.com/p/picoc/
[8] Plan 9. Website http://pdos.csail.mit.edu/6.828/2012/
[9] Sos simple operating system. Website http://sos.enix.org/en/MainPage
[10] Xinu web resource http://www.xinu.cs.purdue.edu
[11] Yale’s xv6 operating system course. Website. http://zoo.cs.yale.edu/classes/cs422/2014/
[12] Robert Love. Understanding the Linux Kernel 3rd edition. OReilly Media, 2001
[13] Robert Morris Russ Cox, Frans Kasshoek. xv6 a simple, Unix-like teaching operating system. MIT, June 2009

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