Beier, Ernst G.
Stein and Day, 1974
Buku Teks
Mills, Harry, author
[American Management Association, ], 2000
eBooks
Friedman, Myles T., author
Praeger, 1991
Buku Teks
Reich, John W., author
Oxford University Press, 2016
eBooks
Bryan, G. T.
Hodder and Stoughton, 1977
Buku Teks