Cross, Amanda, author
Ballantine books, 1989
Buku Teks
Dendermonde, Max
EM. Querido's Uitgeverij N.V, 1967
Buku Teks
Cooley, Leland Frederick, author
Doubleday & Company, Inc, 1965
Buku Teks
Puzo, Mario, author
Putnam, 1978
Buku Teks
Hare, Bill, author
[American Management Association, ], 2004
eBooks