Mitchell, W.
Macmillan, 1973
Buku Teks
British Institute of Management , 1951
Buku Teks
Robertson, D.J.
At the University Press , 1960
Buku Teks
Giestavia Prixasti
The Free Press , 1958
Buku Teks
Ireson, William Grant, 1914-
Prentice-Hall, 1959
Buku Teks