referral
    n 1: a person whose case has been referred to a specialist or
         professional group; "the patient is a referral from Dr.
         Bones"
    2: a recommendation to consult the (professional) person or
       group to whom one has been referred; "the insurance company
       says that you need a written referral from your physician
       before seeing a specialist"
    3: the act of referring (as forwarding an applicant for
       employment or referring a matter to an appropriate agency)