Roemer, Milton I.
National health systems of the world : volume one, the countries
Oxford University Press, 1991
 Buku Referensi
Caldwell, Wallace Everett
The ancient world
Holt, Rinehart and Winston, 1963
 Buku Teks
Matthews, Rupert
Ancient world
Miles Kelly, 2007
 Buku Teks
Caldwell, Wallace Everett
The ancient world
Holt, Rinehrt and Winston, 1963
 Buku Teks
The World affairs companion : the essential one-volume guide to global issues
Gerald Segal
Simon and Schuster, 1996
 Buku Referensi