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-rw-r--r--doc/src/sgml/isn.sgml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/isn.sgml b/doc/src/sgml/isn.sgml
index 4a2e7da7630..c1da702df63 100644
--- a/doc/src/sgml/isn.sgml
+++ b/doc/src/sgml/isn.sgml
@@ -364,7 +364,9 @@ SELECT isbn13(id) FROM test;
The prefixes used for hyphenation were also compiled from:
<itemizedlist>
<listitem><para><ulink url="http://www.gs1.org/productssolutions/idkeys/support/prefix_list.html"></ulink></para></listitem>
- <listitem><para><ulink url="http://www.isbn-international.org/en/identifiers.html"></ulink></para></listitem>
+ <listitem><para><ulink url="http://en.wikipedia.org/wiki/List_of_ISBN_identifier_groups"></ulink></para></listitem>
+ <listitem><para><ulink url="https://www.isbn-international.org/content/isbn-users-manual"></ulink></para></listitem>
+ <listitem><para><ulink url="http://en.wikipedia.org/wiki/International_Standard_Music_Number"></ulink></para></listitem>
<listitem><para><ulink url="http://www.ismn-international.org/ranges.html"></ulink></para></listitem>
</itemizedlist>