Not clear what you mean by:
reference to a particular server?
If you are talking about checking Objects on other servers you can loop through the server you are on as well as using a combination of the sys.servers, the Information_Schema and dynamic SQL. If you are saying that you want to look at objects that have a specific server references in their DDL you could do something like
SELECT OBJECT_TYPE = 'VIEW', * FROM INFORMATION_SCHEMA.VIEWS
WHERE VIEW_DEFINITION LIKE '%<whateverserver>%'
UNION ALL
SELECT 'ROUTINE' FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_DEFINITION LIKE '%<whateverserver>%'
-- Itzik Ben-Gan 2001