Todorova, Elissaveta
The Bulgarians in the ottoman empire
Sofia press, 1987
 Buku Teks
Grant, Michael
The Collapse and Recovery of the Roman Empire
Routledge, 1999
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Atlas of the British empire General
Christopher Bayly, editor
acts On File Book, 1989
 Buku Referensi
Emerson, Rupert, author
From empire to nation
Harvard Univ. Press, 1960
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Dallin, David J
The New Societ empire
Hollis ,
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