Black, C.E.
The Establishment of constitutional government in Bulgaria / C. E. Black
Princeton University press, 1943
 Buku Teks
Pritchett, C. Herman
The American constitutional system
McGraw-Hill, 1963
 Buku Teks
Pritchett, C. Herman
The American constitutional system
McGraw-Hill, 1981
 Buku Teks
Dean, Meryll
Japanese legal system
Cavendish Publishing Limited, 2002
 Buku Teks
Hrebenar, Ronald J
The Japanese party system
Westview Press, 1986
 Buku Teks