Leys, Simon
Penguin Books, 1978
Buku Teks
Willis, Bailey
Stanford University Press , 1949
Buku Teks
The Commercial Press, 1936
Buku Teks
Davis, John Francis, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
Little, Archibald, Mrs., -1926, author
Hutchinson, 1899
Buku Teks