edited by Heinz Eulau and James G. March
Prentice-Hall, 1969
Buku Teks
Sabine, George H., author
Harcourt Brace College Publishers, 1973
Buku Teks
Andre M N Renzaho
Imperial College Press, 2016
Buku Teks
Unger, Roberto Mangabeira
The Free Press, 1975
Buku Teks
Schroder, Peter, author
Frriedrich Naumann Stiftung, 2004
Buku Teks