You can easily find tables referenced by foreign keys with a script similar to the following:
SELECT [table] = s.name + N'.' + t.name
FROM sys.tables AS t
INNER JOIN sys.schemas AS s
ON t.[schema_id] = s.[schema_id]
WHERE EXISTS
(
SELECT 1 FROM sys.foreign_keys AS fk
WHERE fk.referenced_object_id = t.[object_id]
);