Wang, Gungwu, author
Allen & Unwin, 1992
Buku Teks
Ratih Hardjono, author
Gramedia Pustaka Utama , 1992
Buku Teks
Fryar, Maridell
National Textbook Co., 1979
Buku Teks
Smith, Pauline
The Vanguard Press, 1964
Buku Teks
Wills, Pauline
Headway , 1994
Buku Teks