Carty, Anthony, author
Edinburgh University Press, 2007
Buku Teks
Distributed by Almqvist & Wiksell International, 1974
Buku Teks
Humanities Press, 1995
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Penguin Books, 1972
Buku Teks
Grana, Sheryl J
Prentice-Hall, 1999
Buku Teks