When you hand out your business card, always hand out two. "I’m giving you two cards, one for you and one to give to someone who might need my services."
This causes them to think about who they know who might need your services. They might think of someone immediately and tell you. They might ask for additional cards, because they know several people to give them to.
It also plants the seed in their mind that they should be on the lookout for referrals.
Simple, but it works.
