While certainly wouldn't be qualified to speak for these three sororities you've identified, I can direct you on how to get some information on them.
You can reach all three sororities via their national homepage from
http://www.greeknet.net . In addition, you might try searching/browsing for your college and visiting the individual chapter's homepage.
These resources should start you on your way.
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GreekNet: Fraternity and Sorority Search Engine
http://www.greeknet.net