edited by M. David Ermann and Richard J. Lundman
Oxford University Press, 1978
Buku Teks
Konrad Adenauer Stiftung (Yayasan Konrad Adenauer), 2004
Buku Teks
Cullingworth, J.B., author
Allen & Unwin, 1973
Buku Teks
Geneva United Nations 1975,
Buku Teks
Stein, Eric
The Bobbs-Merrill , 1963
Buku Teks