李成嶽

有效電話技巧 = Telephone Techniques by: Walker,, Lin, (1948- ); 華克 ((Walker, Lin, 1948-) ); 李成嶽 (Language materials, printed)

有效溝通 = Effective communication by: 陸伯克 ((Roebuck, Chris, 1956-) ); Roebuck, Chris (1956 ); 李成嶽 (Language materials, printed)