Lawrence Butler, Harriet Jones, edited
Heinemann ,
Buku Referensi
Cronin, E. James, author
Routledge, 1991
Buku Teks
Routledge, 1996
Buku Teks
edited, Nathan Reingold; edited, Ida H. Reingold
University of Chicago Press, 1981
Buku Referensi
Welch, David, author
Heinemann, 1994
Buku Teks