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diff --git a/ref.bib b/ref.bib
index 7a9904b..ed4d5ae 100644
--- a/ref.bib
+++ b/ref.bib
@@ -1,3 +1,14 @@
+@Book{Andersen_2015,
+  title =        "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",
+  series =       "Innovation and Change in Professional Education, 12",
+  author =       "Anders Siig Andersen and Simon B. Heilesen",
+}
+
 @Book{Allemang_2020,
   title =        "Semantic Web for the Working Ontologist: Effective Modeling for Linked Data, {RDFS}, and {OWL}",
   ISBN =         "978-1-4503-7617-4",
@@ -72,6 +83,20 @@
   year =         "2011",
 }
 
+@Article{Heilesen_2016,
+  title =        "Projektarbejde og akademisk {IT}-skoling",
+  volume =       "9",
+  ISSN =         "1903-248X",
+  URL =          "http://dx.doi.org/10.7146/lom.v9i15.23106",
+  doi =          "10.7146/lom.v9i15.23106",
+  number =       "15",
+  journal =      "Tidsskriftet Læring og Medier (LOM)",
+  publisher =    "Det Kgl. Bibliotek/Royal Danish Library",
+  author =       "Simon Heilesen and Søren Davidsen",
+  year =         "2016",
+  month =        may,
+}
+
 @Article{Janowicz_2014,
   title =        "Five stars of Linked Data vocabulary use",
   volume =       "5",