diff --git a/manifest.yaml b/manifest.yaml
index 5a61905..a65fc46 100644
--- a/manifest.yaml
+++ b/manifest.yaml
@@ -8,13 +8,13 @@ dublin_core:
   subject: Bible
   description: ""
   language:
-    identifier: arb
+    identifier: 'arb'
     title: العربية
     direction: rtl
   source:
     -
-      identifier: avd
-      language: arb
+      identifier: 'avd'
+      language: 'arb'
       version: '2015-11-20'
   rights: 'CC BY-SA 4.0'
   creator: 'Door43 World Missions Community'