DRUCKER PETER F. (1999). MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. BUTTERWORTH-HEINEMANN.
Chicago-čujuhus (17. p.)DRUCKER PETER F. MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. OXFORD: BUTTERWORTH-HEINEMANN, 1999.
MLA-čujuhus (9. p.)DRUCKER PETER F. MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. BUTTERWORTH-HEINEMANN, 1999.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.