1 files changed, 12 insertions, 4 deletions
diff --git a/ref.bib b/ref.bib
index c8ba3a3..aa96980 100644
--- a/ref.bib
+++ b/ref.bib
@@ -1,12 +1,20 @@
 @Book{Andersen_2015,
-  title =        "The Roskilde Model: Problem-Oriented Learning and Project Work",
+  booktitle =    "The Roskilde Model: Problem-Oriented Learning and Project Work",
   doi =          "10.1007/978-3-319-09716-9",
   publisher =    "Springer International Publishing",
   year =         "2015",
-  ISBN =         "3-319-09716-4",
-  language =     "eng",
+  ISBN =         "978-3-319-09716-9",
+  language =     "en-US",
   series =       "Innovation and Change in Professional Education, 12",
-  author =       "Anders Siig Andersen and Simon B. Heilesen",
+  editor =       "Anders Siig Andersen and Simon B. Heilesen",
+}
+
+@InBook{Heilesen_2015,
+  crossref =     "Andersen_2015",
+  title =        "Supporting Project Work with Information Technology",
+  doi =          "10.1007/978-3-319-09716-9_16",
+  author =       "Simon B. Heilesen",
+  pages =        "245--259",
 }
 
 @Book{Allemang_2020,