diff --git a/main.pdf b/main.pdf
index efb6dc9..4a71702 100644
Binary files a/main.pdf and b/main.pdf differ
diff --git a/main.tex b/main.tex
index 47c4663..72456a1 100644
--- a/main.tex
+++ b/main.tex
@@ -370,7 +370,7 @@ zuzusenden, kann er sie mit seinem Schlüssel entschlüsseln und den Inhalt lese
 \newpage
 \section{Referenzen}
   \nocite{*}
-  \bibliographystyle{plain}
+  \bibliographystyle{unsrtnat}
   \bibliography{bib}
 \include{latex}  
 \end{document}
diff --git a/math_rsa.cls b/math_rsa.cls
index c589f63..26c61f0 100644
--- a/math_rsa.cls
+++ b/math_rsa.cls
@@ -84,6 +84,9 @@ headsep=1em
 % Reference a Bibtext item
 \RequirePackage{cite}
 
-% remove the thebibliography header
+% remove the the bibliography header
 \RequirePackage{etoolbox}
 \patchcmd{\thebibliography}{\section*{\refname}}{}{}{}
+
+%sort the bibliography by appearance
+\RequirePackage[numbers,sort&compress]{natbib}