diff --git a/index.html b/index.html
index b40eb24..36291b1 100644
--- a/index.html
+++ b/index.html
@@ -696,10 +696,11 @@
           <p>
             <ul>
               <li><a href="https://en.wikipedia.org/wiki/Altair_8800">Wikipedia: Altair 8800</a></li>
-              <li><a href="https://en.wikipedia.org/wiki/Intel_8080">Intel 8080 CPU</a></li>
+              <li><a href="https://en.wikipedia.org/wiki/Intel_8080">Wikipedia: Intel 8080 CPU</a></li>
               <li><a href="http://www.classiccmp.org/dunfield/r/8080.txt">Intel 8080 instruction set</a></li>
               <li><a href="https://altairclone.com/altair_manuals.html">Original Altair 8800 manuals</a></li>
-              <li><a href="http://www.classiccmp.org/dunfield/r/8080asm.pdf">Intel 8080 Assembly Language Programming Manual</a></li>
+              <li><a href="https://altairclone.com/downloads/manuals/Altair%208800%20Operator's%20Manual.pdf">Altair 8800 Operator's Manual</a></li>
+                <li><a href="http://www.classiccmp.org/dunfield/r/8080asm.pdf">Intel 8080 Assembly Language Programming Manual</a></li>
               <li><a href="https://s2js.com/altair/">Another Altair 8800 simulator</a></li>
             </ul>
           </p>
diff --git a/js/l10n.js b/js/l10n.js
index 3af4ec2..ef6fb32 100644
--- a/js/l10n.js
+++ b/js/l10n.js
@@ -204,6 +204,11 @@ l10n.MESSAGES = {
         'en': 'Turn off Altair 8800.',
         'zh': '关闭 Altair 8800',
     },
+
+    'reference-title': {
+        'en': 'References',
+        'zh': '参考资料',
+    },
 };
 
 /**