--- a/Journal/document/root.bib	Wed Sep 09 11:24:19 2015 +0100
+++ b/Journal/document/root.bib	Sun Oct 04 23:02:57 2015 +0100
@@ -1,4 +1,11 @@
 
+@Book{Silberschatz13,
+  author =    {A.~Silberschatz and P.~B.~Galvin and G.~Gagne},
+  title =        {Operating System Concepts},
+  publisher =    {John Wiley \& Sons},
+  year =         {2013},
+  edition =   {9th}
+}
 
 @Book{liu00,
   author =    {J.~W.~S.~Liu},