Drucker, P. (2006). Management challenges for the 21st Century. Palgrave Macmillan Punl.
Chicago-čujuhus (17. p.)Drucker, Peter. Management Challenges for the 21st Century. New York: Palgrave Macmillan Punl, 2006.
MLA-čujuhus (9. p.)Drucker, Peter. Management Challenges for the 21st Century. Palgrave Macmillan Punl, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.