Moncrieff, A.R. Hope, author
Gramercy, 1995
Buku Referensi
edited by Thomas H Briggs, Max J. Herzberg, Emma Miller Bolenius
Mifflin , 1932
Buku Teks
Ruchs, Barbara
New York : Routledge , 2004
Buku Teks
Ward, Russel, author
Oxford University Press, 1964
Buku Teks
Palmer, Vance, author
Currey O'Neill, 1966
Buku Teks