1 files changed, 7 insertions, 10 deletions
diff --git a/ref.bib b/ref.bib
index 9e66c0e..c072d70 100644
--- a/ref.bib
+++ b/ref.bib
@@ -65,18 +65,15 @@
   pages =        "19--43",
 }
 
-@Article{DuCharme_2011,
+@Booklet{DuCharme_2013,
   author =       "Bob {DuCharme}",
-  copyright =    "COPYRIGHT 2011 Ringgold, Inc.",
-  ISSN =         "0887-3763",
-  journaltitle = "Reference & Research Book News",
+  ISBN =         "978-1-4493-7143-2",
   language =     "en",
-  number =       "6",
-  publisher =    "Ringgold, Inc",
-  address =      "Portland",
-  title =        "Learning {SPARQL}; querying and updating with {SPARQL} 1.1",
-  volume =       "26",
-  date =         "2011",
+  publisher =    "O'Reilly Media",
+  title =        "Learning {SPARQL}",
+  subtitle =     "querying and updating with {SPARQL} 1.1",
+  edition =      "2",
+  date =         "2013-08-13",
 }
 
 @Book{Ebersbach_2006,