Facts on File Publications, 1986
Buku Teks
Inter-Parliamentary Union
Facts on File Publications, 1986
Buku Referensi
Inter-Parliamentary Union
Facts on File Publications, 1986
Buku Referensi
Duke University Press, 1979
Buku Teks
Blondel, Jean
Prentice-Hall, 1973
Buku Teks