Dore, Ronald, author
George Allen and Unwin, 1973
Buku Teks
Mitchell, W., author
Macmillan, 1973
Buku Teks
British Institute of Management , 1951
Buku Teks
Robertson, D.J.
At the University Press , 1960
Buku Teks
Giestavia Prixasti, author
The Free Press , 1958
Buku Teks