edited by Marianne Hundt, Sandra Mollin, Simone E. Pfenninger
Cambridge University Press, 2017
Buku Teks
edited by Norman Page
Macmillan, 1984
Buku Teks
Doyle, Margaret, author
Women's Press, 1995
Buku Referensi
Landau, Sidney I., author
Cambridge University Press, 2001
Buku Referensi
Dakin, Julian
Longman , 1975
Buku Teks