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