How to find tables in a database without a clustered index

SELECT TOP 1000 o.name, i.type_desc, o.type_desc, o.create_date
FROM sys.indexes i
INNER JOIN sys.objects o
 ON  i.object_id = o.object_id
WHERE o.type_desc = 'USER_TABLE'
AND i.type_desc = 'HEAP'
ORDER BY o.name
GO