The people who work the hardest to get referrals, it seems to me, are the people who least deserve them.
If you make average stuff for average people, why exactly will someone refer you? If you are busy selling standard insurance policies to standard insurance clients, why will someone refer you? Because you're good at golf?
In fact, the best way to get referrals is to change what you do, what you sell, how you act when times are difficult, how generous you are when you don't need to be.
Yes, you should make it easy for people to refer you. Yes you should be aware that asking for referrals can help. (John has a new book about this). But no, all the tactics in the world won't help you get the referrals you want. The only thing that will make you remarkable is being worth remarking about.