Moncrieff, A.R. Hope, author
Gramercy Books, 1995
Buku Referensi
Barnett, Mary, author
Grange Books, 1997
Buku Referensi
Coleman, Janet, author
Blackwell Publishers, Ltd, 2000
Buku Teks
Martin, Thomas R.
Yale University Press, 1996
Buku Teks
Peyser, Ethel, author
G.P. Putnam's Sons, 1956
Buku Teks