Eaglestone, Robert, author
Routledge , 2005
Buku Teks
Baker, Nancy L., author
The Modern Language Association of america, 1985
Buku Referensi
Heinemann Educational Books, 1981
Buku Teks
Allen, W. Stannard, author
Longman, 1974
Buku Teks
Smith, E Evelyn
London JM Dent & Sons 1945
Buku Teks