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Contact the Alum Panhellenic in your hometown.

However, if you meet sorority alumnae in your college town or elsewhere, or if you have sorority relatives/friends, it is perfectly acceptable to have them write your references. It is also a good idea to talk to current collegiate sorority members at your school-- ones who have been through recruitment as a sorority member. They can tell you if recommendations from "in-house" alumnae (graduates of your university) are valued over others. Also, talk to the Office of Greek Life.

The best references come from people who know you personally, and know you well. This is not always possible, and by networking with your hometown's alumnae pan, you may be able to secure informational references. You will not be penalized if your references are not from someone who has known you since birth, but someone who knows you well can truly speak to your greatest assets and potential value to the organization.

Good luck and good for you to start planning ahead now! Read the link in my sig for more information that you may find helpful.

ETA: Also remember that you are going to be interviewed for membership opportunities in all of the sororities at your campus if you go through formal recruitment, and it is best to have recs for all of the chapters. You may think coming in that you know which ones you might consider joining, but perceptions and options change once you get to meet a sorority in recruitment, and you should do your best to get recs for all in order to be truly prepared. Keep an open mind coming into recruitment-- any of the organizations on your campus have a lot to offer!