diff --git a/tabellio/documents/document.py b/tabellio/documents/document.py
index 5dc46a8..fce4350 100644
--- a/tabellio/documents/document.py
+++ b/tabellio/documents/document.py
@@ -57,7 +57,8 @@ class Document(Item, BasePublication):
 
     @property
     def doctype_str(self):
-        return typenames.MAPPING.get(self.doctype, u'Document (%s)' % self.doctype)
+        if self.doctype is None: return _('Unknown')
+        return typenames.MAPPING.get(self.doctype, self.doctype)
 
     @property
     def reftitle(self):
diff --git a/tabellio/documents/dossier.py b/tabellio/documents/dossier.py
index 899a145..0829f59 100644
--- a/tabellio/documents/dossier.py
+++ b/tabellio/documents/dossier.py
@@ -179,7 +179,8 @@ class Dossier(Item, BasePublication):
 
     @property
     def dostype_str(self):
-        return typenames.MAPPING.get(self.dostype, u'Dossier (%s)' % self.dostype)
+        if self.dostype is None: return _('Unknown')
+        return typenames.MAPPING.get(self.dostype, self.dostype)
 
     @property
     def state_str(self):
diff --git a/tabellio/documents/question.py b/tabellio/documents/question.py
index 15b2acc..acc4e66 100644
--- a/tabellio/documents/question.py
+++ b/tabellio/documents/question.py
@@ -104,7 +104,8 @@ class Question(Item, BasePublication):
 
     @property
     def questype_str(self):
-        return typenames.MAPPING.get(self.questype, u'Question (%s)' % self.questype)
+        if self.questype is None: return _('Unknown')
+        return typenames.MAPPING.get(self.questype, self.questype)
 
     @property
     def state_str(self):