Get the lastest record from the query

I have a query which gives me 5 records in the sql, but I want to show one record which is latest one.

Below is my query

Select a.mkey, c.type_desc DOC_TYPE, a.doc_no INWARD_NO,  
 convert(varchar, a.doc_date,103)date, 
 a.to_user, a.No_of_pages, Ref_No, d.type_desc DEPT_RECEIVED,  b.first_name    + ' ' + 
 b.last_name EMP_RECEIVED, b.first_name + ' ' + b.last_name NAME, 
 b.email 
  from inward_doc_tracking_hdr a , user_mst b ,type_mst_a c,
    type_mst_a d 
 where a.to_user = b.mkey  and a.doc_type = c.master_mkey  
 and a.dept_received = d.Master_mkey   and a.to_user = '1260'

Below is the result

I am using sql-server-2005

I tried with TOP1 but it is not giving me the latest record