Mager, Robert F., author
Fearon, 1968
Buku Teks
Lodge, George C., author
Harper & Row, 1962
Buku Teks
edited by M. A. Cuenod [and] S. Kahne
International Federation of Automatic Control , 1973
Buku Teks
Cross, Harry, author
Policy Project, 2002
Buku Teks
Anderfelt, Ulf, author
Martinus Nijhoff, 1971
Buku Teks