diff --git a/src/sources.bib b/src/sources.bib
index cbbda88..de0f362 100644
--- a/src/sources.bib
+++ b/src/sources.bib
@@ -136,7 +136,7 @@ doi = {10.1007/978-0-387-85820-3_23}
 
 @misc{handsonaiI,
     author        = {Andreas Schörgenhumer, Bernhard Schäfl, Michael Widrich},
-    title         = {Lecture notes in Hands On AI I, Unit 4 & 5},
+    title         = {Lecture notes in Hands On AI I, Unit 4 \& 5},
     month         = {October},
     year          = {2021},
     publisher={Johannes Kepler Universität Linz}