Gilbert, Erik, author
Pearson Educational, 2004
Buku Teks
Bohannan, Paul, author
The National History Press, 1964
Buku Teks
edited by Phillis M. Martin and Patrick O'Meara
Indiana University Press, 1995
Buku Teks
Fage, J.D., author
Routledge, 1995
Buku Teks
edited by Bisheshwar Prasad
Asia Public House, 1960
Buku Teks