Add bibtex snippet.

README.md

@@ -79,6 +79,20 @@ Packet 9
 * [PRRT Wiki](https://git.nt.uni-saarland.de/LARN/PRRT/wikis)
 * [LARN Project Website](http://larn.systems)
 
+## Citing Us
+
+If you find PRRT useful and incorporate it in your works, we are very happy to hear about it. Please also consider to cite us like this:
+
+```bibtex
+@misc{sic2018prrt, 
+      author = {Schmidt, Andreas}, 
+      title = {PRRT: Predictably Reliable Real-time Transport}, 
+      howpublished={Web page}, 
+      url = {http://prrt.larn.systems}, 
+      year = {2018} 
+} 
+```
+
 ## License
 
 [MIT Licence](LICENSE)