Drucker, P. F. (2011). Innovation & entrepreneurship. Butterworth.
Chicago-čujuhus (17. p.)Drucker, Peter F. Innovation & Entrepreneurship. Oxford: Butterworth, 2011.
MLA-čujuhus (9. p.)Drucker, Peter F. Innovation & Entrepreneurship. Butterworth, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.