diff --git a/book/references.bib b/book/references.bib
index 08bb4b2..abb89b4 100644
--- a/book/references.bib
+++ b/book/references.bib
@@ -1,4 +1,4 @@
-@misc{timon_latex,
+@unpublished{timon_latex,
   title={LaTeX to Markdown conversion},
   author={Idema, Timon},
   institution ={Delft University of Technology},