^Viet Nam Social Sciences -2007 Issues 1-3 - Page 62 "Just late 1997, there were six projects carrying out research on some artisans such as Quach Thi Ho (A Dao singer), Ha Thi Cau (Blind - Xam singer),"
^Vietnam Courier 1986 -- Page 25 "... on the dan bau (one -stringed zither) was selected to be part of a repertoire to be presented to world audiences. The four remaining airs were also selected to be part of a list of choice items : a hat xam (minstrel's) air sung by Mrs Ha-Thi Cau, "
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