Greif, Avner, author
Cambridge University Press, 2005
Buku Teks
Rickard, J.A., author
Barnes & Noble, 1952
Buku Teks
edited by. Richard Garnett
Delhi, India Akashdeep 1992
Buku Referensi
Chicago : The University of Chicago Press
Majalah, Jurnal, Buletin
Saunders, Anthony, author
McGraw-Hill, 2001
Buku Teks