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diff --git a/synth_bibliography.bib b/synth_bibliography.bib
index b44e67b..8c954b5 100644
--- a/synth_bibliography.bib
+++ b/synth_bibliography.bib
@@ -3,7 +3,6 @@
   YEAR = {2011},
   TITLE = {Synthesizer - So funktioniert elektronische Klangerzeugung},
   EDITION = {6. Aufl.},
-  ISBN = {978-3-941-53170-3},
   PUBLISHER = {PPV Medien GmbH},
   ADDRESS = {Bergkirchen},
 }
@@ -11,7 +10,6 @@
 @book{Manning1985,
   title={Electronic and computer music},
   author={Manning, P.},
-  isbn={9780193119185},
   lccn={lc84007618},
   year={1985},
   publisher={Clarendon Press},
@@ -23,7 +21,6 @@
   YEAR = {1987},
   TITLE = {Elektronische Musik},
   EDITION = {},
-  ISBN = {978-3-795-71786-5},
   PUBLISHER = {Schott},
   ADDRESS = {Wien},
 }
@@ -33,7 +30,6 @@
   YEAR = {1990},
   TITLE = {Soundscapes - elektronische Klangerzeugung und Musik},
   EDITION = {1. Auflage,},
-  ISBN = {978-3-733-20058-9},
   PUBLISHER = {Lied der Zeit},
   ADDRESS = {Berlin},
 }
@@ -56,7 +52,6 @@
 @book{Sontheimer2004,
   title={Audio-Schaltungstechnik},
   author={Sontheimer, Robert},
-  isbn={9783895761546},
   year={2004},
   publisher={Elektor},
   address = {Aachen}
@@ -67,7 +62,6 @@
   YEAR = {1975},
   TITLE = {Musical Engineer's Handbook - Musical Engineering for Electronic Music},
   EDITION = {first},
-  ISBN = {},
   PUBLISHER = {Electronotes},
   ADDRESS = {Ithaca, NY},
 }