Drucker, P. (1985). Innovation and entrepreneurship. Heinemann.
Chicago-čujuhus (17. p.)Drucker, Peter. Innovation and Entrepreneurship. London: Heinemann, 1985.
MLA-čujuhus (9. p.)Drucker, Peter. Innovation and Entrepreneurship. Heinemann, 1985.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.