Lavell, C.F., author
Imperial England
Macmillan, 1919
 Buku Teks
Hadas, Moses, author
Imperial Rome
Time-Life Books, 1965
 Buku Teks
Elton, Lord, author
Imperial commonwealth
Collins, 1945
 Buku Teks
O`Connell, D. P., author
Opinions on imperial constitutional law
The Law Book Company, 1971
 Buku Teks
Loewe, Michael
Imperial China / Michael Loewe
Frederick A. Preager, 1965
 Buku Teks
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