diff --git a/vrobbler/apps/books/admin.py b/vrobbler/apps/books/admin.py
index abfe0e0..4082475 100644
--- a/vrobbler/apps/books/admin.py
+++ b/vrobbler/apps/books/admin.py
@@ -34,7 +34,7 @@ class BookAdmin(admin.ModelAdmin):
     ]
 
     def issue_or_volume(self, obj):
-        return obj.issue_number or obj.volume_number
+        return obj.subtitle
 
 
 @admin.register(Paper)