edited by John J. McIntyre
National Defense University Press, 1979
Buku Teks
Giphart, Ronald
Kwadraat, 1997
Buku Teks
Crosland, Anthony, 1918-, author
Macmillan, 1957
Buku Teks
Toffler, Alvin, author
Bantam Books, 1990
Buku Teks
Bono, Edward de, author
M. Temple Smith, 1979
Buku Teks