Williamson, J.A.
The British Empire and Common Wealth
Macmillan, 1965
 Buku Teks
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
 Buku Teks
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
 Buku Teks
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