diff --git a/docs/00b-basics/00-basics.adoc b/docs/00b-basics/00-basics.adoc
index 79711f3..058dfce 100644
--- a/docs/00b-basics/00-basics.adoc
+++ b/docs/00b-basics/00-basics.adoc
@@ -15,3 +15,10 @@ include::04-prerequisites-for-this-training.adoc[{include_configuration}]
 include::05-curriculum-outline.adoc[{include_configuration}]
 
 include::06-complementary-information.adoc[{include_configuration}]
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/01-module-block-1/references.adoc b/docs/01-module-block-1/references.adoc
index 8fb3e41..40ceb2f 100644
--- a/docs/01-module-block-1/references.adoc
+++ b/docs/01-module-block-1/references.adoc
@@ -12,3 +12,10 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/02-module-block-2/references.adoc b/docs/02-module-block-2/references.adoc
index 46b9499..90ba849 100644
--- a/docs/02-module-block-2/references.adoc
+++ b/docs/02-module-block-2/references.adoc
@@ -10,3 +10,10 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/03-module-block-3/references.adoc b/docs/03-module-block-3/references.adoc
index a099be3..bb2975b 100644
--- a/docs/03-module-block-3/references.adoc
+++ b/docs/03-module-block-3/references.adoc
@@ -11,3 +11,10 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/04-module-block-4/references.adoc b/docs/04-module-block-4/references.adoc
index 2b0aba1..eac724b 100644
--- a/docs/04-module-block-4/references.adoc
+++ b/docs/04-module-block-4/references.adoc
@@ -12,3 +12,11 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/05-module-block-5/references.adoc b/docs/05-module-block-5/references.adoc
index 5b04af8..459da49 100644
--- a/docs/05-module-block-5/references.adoc
+++ b/docs/05-module-block-5/references.adoc
@@ -10,3 +10,10 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/20-examples/00-examples.adoc b/docs/20-examples/00-examples.adoc
index da44e62..574926d 100644
--- a/docs/20-examples/00-examples.adoc
+++ b/docs/20-examples/00-examples.adoc
@@ -5,3 +5,10 @@ include::01-examples-duration-terms.adoc[{include_configuration}]
 include::02-learning-goals.adoc[{include_configuration}]
 
 include::references.adoc[{include_configuration}]
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/20-examples/references.adoc b/docs/20-examples/references.adoc
index 11e78ae..c071c47 100644
--- a/docs/20-examples/references.adoc
+++ b/docs/20-examples/references.adoc
@@ -11,3 +11,10 @@ Eine Quelle wird über `\<<label>>` referenziert. Dieses muss in `99-references/
 
 A reference source is referenced via `\<<label>>`. The label has to be defined in `99-references/00-references.adoc`.
 ====
+
+// tag::DE[]
+// silence asciidoctor warnings
+// end::DE[]
+// tag::EN[]
+// silence asciidoctor warnings
+// end::EN[]
diff --git a/docs/99-references/00-references.adoc b/docs/99-references/00-references.adoc
index 4db70b9..42f1ef4 100644
--- a/docs/99-references/00-references.adoc
+++ b/docs/99-references/00-references.adoc
@@ -1,7 +1,3 @@
-// header file for curriculum section "References"
-// (c) iSAQB e.V. (https://isaqb.org)
-// ===============================================
-
 [bibliography]
 == {references}