Haley, John Owen, author
Edward Elgar Publishing, 2016
Buku Teks
Cambridge University Press , 1993
Buku Teks
Koontz, Dean R. (Dean Ray), 1945-, author
Alfred A. Knopf , 1994
Buku Teks
Sharp, David, author
Bay Books, 1984
Buku Referensi
River, W.H.R.
Routledge, 1924
Buku Teks