edited by Helmut Arntz
Press and Information Office of the Federal Government, 1961
Buku Teks
[, Springer], 2012
eBooks
New York, N.Y. : New York University Press, 1977,
Buku Teks
Konrad-Adenauer-Stiftung, 2014
Majalah, Jurnal, Buletin
editor Wendy Herring
LexisNexis Butterworths , 2014
Buku Referensi