Lawrence, Mark Atwood, author
Oxford University Press, 2010
Buku Teks
Neal, Larry, author
UK Cambridge University Press, 2015
Buku Teks
Nussbaum, Arthur, author
Macmillan, 1958
Buku Teks
Younger, R. M.
Victoria Hutchinson Group 1982
Buku Teks
Goldschmidt, Arthur, author
Westview Press, 1983
Buku Teks