edited by Leonard H. Goodman
Columbia University Press, 1966
Buku Teks
Rich, William
Overseas development Council, 1973
Buku Teks
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Moulton, Harold G., author
Brookings Institution, 1935
Buku Teks