diff --git a/chapter/layer3.tex b/chapter/layer3.tex
index 5734fed..299b019 100644
--- a/chapter/layer3.tex
+++ b/chapter/layer3.tex
@@ -48,6 +48,8 @@ Always remember the following points for Cisco devices:\cite{wiki:Administrative
 
 Used in IP networks (v4) and a \gls{lsr} protocol. Defined as OSPFv2 on \rfc{2328} from 1998.
 
+\cite{Theendle83:online}
+
 \subsection{Algorithm}
 
 The protocol uses Dijkstra\tsq{s} algorithm when calculating metrics mathematically.
diff --git a/references-websites.bib b/references-websites.bib
index 3094e1c..e47c6c3 100644
--- a/references-websites.bib
+++ b/references-websites.bib
@@ -48,4 +48,13 @@
     month = {February},
     year = {2018},
     note = {(Accessed on 02/18/2018)}
+}
+
+@misc{Theendle83:online,
+    author = {},
+    title = {The endless story of OSPF vs IS-IS - Part 2 "The history" - Networkers-online.com},
+    howpublished = {\url{http://www.networkers-online.com/blog/2010/04/the-endless-story-of-ospf-vs-is-is-part-2-the-history/}},
+    month = {April},
+    year = {2010},
+    note = {(Accessed on 02/18/2018)}
 }
\ No newline at end of file