Yes. You should get references from anyone you trust. It is always a good idea to shop around until you find an attorney that you feel will do the best job for you.
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I'm not sure I understand what you are asking here. Why would it be improper to ask for referrals? You should call around to as many lawyers as you can and get a sense for how they interact and charge, etc. Then pick the best fit to work with.
You can ask your current lawyer assuming you trust her judgment; you can also ask at your state bar for referrals. You may want to use Avvo's "find a lawyer" tab up top to research lawyers either in your area or who may be outside your area but practice in that areas you need assistance with.
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A good attorney would be glad to provide you with a reference. Also, you can easily contact your state's bar association and confirm the history of a particular lawyer - whether they have ever been sanctioned/disciplined. But I would also get references! Another way to find a good "business" lawyer is to ask a few friends/business owners who they use.
It sounds like you're asking whether you can ask a potential attorney for client references (i.e., what do your clients think of you). If that's your question, then yes, you can. I think a better way to find a good attorney, however, is to ask people you respect who they use for legal services and why they like them. I know many of my clients got to our office by word of mouth - other clients recommended us.
I wish you luck with your search. I'm sure you'll find a good attorney who can help you
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