diff --git a/sections/introduction.tex b/sections/introduction.tex
index 7fb3173dbca1cbfa6d9f4d65fa4a9b5fc37a29ec..9189fe74f1879142d89da1dbea3efca73d765db9 100644
--- a/sections/introduction.tex
+++ b/sections/introduction.tex
@@ -1,6 +1,6 @@
 \chapter{Introduction}\label{ch:introduction}
 Automated testing is one type of software testing which is expected to review, validate software products and find errors in these products. Compared to manual testing, it has a huge benefit in execution of test cases, while test cases are automatically generated. \\
-Also, it might be a meaningful approach to raise the security and quality in web-based software architectures using REST interfaces. [2]
+Also, it might be a meaningful approach to raise the security and quality in web-based software architectures using REST interfaces. \cite{knuth84}, \cite{goossens94}
 
 % example with [2]
 One kind of testing such architectures is to validate REST interfaces and check if there are errors in them. \\
diff --git a/thesis-copy.tex b/thesis-copy.tex
index b0f8168082379270d66ee78ba0a4632cf43e485c..974114bf50ba306c6c802d0d50656d651922ccbc 100644
--- a/thesis-copy.tex
+++ b/thesis-copy.tex
@@ -129,7 +129,7 @@
 \input{sections/eval.tex}
 \input{sections/zusammenfassung.tex}
 
-\printbibliography[heading=bibintoc]\label{sec:bibliography}%
+\printbibliography[heading=bibintoc]\label{sec:bibliography}
 
 \appendix
 \input{sections/appendix}