9.Le Thuong. "Thoi tien chien trong tan nhac (1938-1946)" in Tuyen tap Nhac Tien chien. (Saigon: Ke si Xuat ban, 1971), 63. 10."Bach-Khoa phong van gioi nhac si: Vo Duc Thu," Bach khoa 151 (15/4/1963), 101-106. Conversation with Le Yen, Hanoi, June 1995. Conversation wi...