adding some reference entries

README.md

@@ -1,3 +1,16 @@
 # latex-example-2022b
 
-Latex example done during lecture 2022b
+Latex example done during lecture 2022b
+
+# Reference examples
+
+```
+\begin{thebibliography}{9}
+\bibitem{texbook}
+Donald E. Knuth (1986) \emph{The \TeX{} Book}, Addison-Wesley Professional.
+
+\bibitem{lamport94}
+Leslie Lamport (1994) \emph{\LaTeX: a document preparation system}, Addison
+Wesley, Massachusetts, 2nd ed.
+\end{thebibliography}
+```