Here are some links to other sites that offer information about women composers.

Book references:

Cohen, Aaron I., editor, International Encyclopedia of Women Composers, R.R. Bowker Co., 1987, New York & London

Sadie, Julie Anne & Rhian Samuel, editors, The Norton/Grove Dictionary of Women Composers, The Macmillan Press Limited, 1995

Pendle, Karen, editor, Women & Music, A History, Indiana University Press, Bloomington & Indianapolis, 1991