Conference Board. (1973). Challenge to leadership: Managing in a changing world. Free Press.
Chicago-čujuhus (17. p.)Conference Board. Challenge to Leadership: Managing in a Changing World. Nueva York: Free Press, 1973.
MLA-čujuhus (9. p.)Conference Board. Challenge to Leadership: Managing in a Changing World. Free Press, 1973.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.