Letters of reference should be written by people that actually know you, not just any alumna from a particular sorority. If you do not know anyone that is a Theta or Tri-Delta, then the only thing that can be provided is a letter of information, not introduction. The chapter will probably learn more from your Recruitment application than they would from a basic letter of introduction.
It is really the responsiblity of the sorority, not the potential member, to seek our recommendations if the sorority requires them (and not all sororities do require them).
Letters of reference are a way of introducing yourself to a chapter, but they are not a guarantee of membership.
Have more questions about recruitment? Visit:
http://panhellenic.tripod.com/FAQ.html
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Fraternally,
Barbara
Zeta Tau Alpha Alumna
If you have to go around telling everyone you're in charge you're not much of a leader.