Forrest-Thomson, Veronica, author
Manchester University Press, 1978
Buku Teks
Pinto, Vivian de Sola
Hutchinson's University Library, 1951
Buku Teks
Macmillan, 1991
Buku Teks
edited by Patrick Brantlinger and William B. Thesing
Blackwell, 2002
Buku Referensi
Lennard, John, author
University Press, 2005
Buku Referensi