Why these sources are great for referrals

Using a referral program to find new hires is nothing new. But many companies don’t take full advantage of that strategy.
The common approach: Ask current employees whom they know that might be interested in a job.
It works, but companies can also get valuable leads by asking former employees and new hires, says hiring consultant Mel Kleiman.
Think about it: The people who’ve been with your company for a while likely don’t have as wide a network of folks outside the organization as newbies and alumni.
New hires may know colleagues at their previous employer who are also looking for a new place to work.
Your company’s alumni may know some good people, too. Keep in contact with them — you may even be able to bring some of the former employees back.