diff --git a/django/apps/base.py b/django/apps/base.py
index 4102780560..40b72c9448 100644
--- a/django/apps/base.py
+++ b/django/apps/base.py
@@ -83,13 +83,13 @@ class AppConfig(object):
                 # would raise when <mod_path> exists but not <cls_name>, with
                 # more context (Python just says "cannot import name ...").
                 raise ImportError(
-                    "cannot import name %r from %r" % (cls_name, mod_path))
+                    "cannot import name '%s' from '%s'" % (cls_name, mod_path))
 
             # Check for obvious errors. (This check prevents duck typing, but
             # it could be removed if it became a problem in practice.)
             if not issubclass(cls, AppConfig):
                 raise ImproperlyConfigured(
-                    "%r isn't a subclass of AppConfig." % entry)
+                    "'%s' isn't a subclass of AppConfig." % entry)
 
             # Obtain app name here rather than in AppClass.__init__ to keep
             # all error checking for entries in INSTALLED_APPS in one place.
@@ -97,7 +97,7 @@ class AppConfig(object):
                 app_name = cls.name
             except AttributeError:
                 raise ImproperlyConfigured(
-                    "%r must supply a name attribute." % entry)
+                    "'%s' must supply a name attribute." % entry)
 
             # Ensure app_names points to a valid module.
             app_module = import_module(app_name)
diff --git a/django/apps/registry.py b/django/apps/registry.py
index 737fc960b8..8a25bad281 100644
--- a/django/apps/registry.py
+++ b/django/apps/registry.py
@@ -181,9 +181,9 @@ class Apps(object):
 
         app_config = self.app_configs.get(app_label)
         if app_config is None:
-            raise LookupError("No installed app with label %r." % app_label)
+            raise LookupError("No installed app with label '%s'." % app_label)
         if only_with_models_module and app_config.models_module is None:
-            raise LookupError("App with label %r doesn't have a models module." % app_label)
+            raise LookupError("App with label '%s' doesn't have a models module." % app_label)
         return app_config
 
     # This method is performance-critical at least for Django's test suite.