diff --git a/src/reference/docbook/tutorial.xml b/src/reference/docbook/tutorial.xml
index 17bb6ee7..3f5ce63b 100644
--- a/src/reference/docbook/tutorial.xml
+++ b/src/reference/docbook/tutorial.xml
@@ -545,7 +545,7 @@
             <para>
                 In this sample application, we are going to use <link xl:href="http://www.jdom.org">JDom 2</link> to handle
                 the XML message.
-                We are also using <link xl:href="http://www.w3schools.com/xpath/">XPath</link>, because it allows us to
+                We are also using <link xl:href="https://www.w3.org/TR/xpath20/">XPath</link>, because it allows us to
                 select particular parts of the XML JDOM tree, without requiring strict schema conformance.
             </para>
             <programlistingco>
diff --git a/src/reference/docbook/why-contract-first.xml b/src/reference/docbook/why-contract-first.xml
index e004ae06..fd52b1fc 100644
--- a/src/reference/docbook/why-contract-first.xml
+++ b/src/reference/docbook/why-contract-first.xml
@@ -21,8 +21,7 @@
                 WSDL stands for Web Services Description Language. A WSDL file is an XML document that describes a Web 
                 service. It specifies the location of the service and the operations (or methods) the service exposes.
                 For more information about WSDL, refer to the 
-                <link xl:href="http://www.w3.org/TR/wsdl">WSDL specification</link>, or read the
-                <link xl:href="http://www.w3schools.com/wsdl/">WSDL tutorial</link>
+                <link xl:href="http://www.w3.org/TR/wsdl">WSDL specification</link>.
             </para>
         </sidebar>
         <para>