Smith, Pauline
The Vanguard Press, 1964
Buku Teks
Wills, Pauline
Headway , 1994
Buku Teks
Blais, Marie-Claire, 1939-, author
McClelland and Stewart, 1982
Buku Teks
Birkets, Sven P
Allyn and Bacon, 1993
Buku Teks
Li, Zhaoguo, tranlator
World Publising Corporations,
Buku Referensi