Hampden-Turner, Charles
Anchor Press , 1974
Buku Teks
Perlman, Richard, author
McGraw-Hill , 1976
Buku Teks
Kershaw, Joseph A.
Brookings Institution, 1970
Buku Teks
Smith, Reginald Heber
Petterson Smith, 1972
Buku Teks
Schiller, Bradley R., author
Prentice-Hall, 1989
Buku Teks