Kaplan, Jacob J.
The challenge of foreign aid policies, problems and possibilities
N.Y. Frederick A. Praeger , 1968
 Buku Teks
Lovel, John P
The challenge of American foreign policy/ John P. Lovell
Macmillan, 1985
 Buku Teks
Indian foreign policy : agenda for the 21st century
editorial board, Lalit Mansingh ... [and others]
Foreign Service Institute in association with Konark Publishers, 1998
 Buku Teks
World Investment Report 1999 foreign direct invesment and the challenge of development : overview
United Nations, 1999
 Buku Teks
World Investment Report 1999 foreign direct investment and the challenge of development
United Nations, 1999
 Buku Teks