Bloomer, Jennifer, author
Yale University Press, 1993
Buku Teks
Scott, P. J. M.
New Jersy Vision and Barnes, 1984
Buku Teks
Macmillan, 1986
Buku Teks
Mountford, James, Sir, author
Oxford Unniversity Press, 1966
Buku Teks
Stout, Hiram Miller, author
Oxford University Press, 1953
Buku Teks