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 	\bibitem{safalra} Smurf Specification,
 	\url{http://safalra.com/programming/esoteric-languages/smurf/specification/}.
 	Opgehaald 27 april 2016.
+
+	\bibitem{esolang:prog} Smurf --- Reversing input on Esolang,
+	\url{http://esolangs.org/wiki/Smurf#Reversing_input}. Opgehaald 27 mei 2016.
 \end{thebibliography}