Gaya APA
Drucker, P, F. (1985).
Innovation And Entre-Preneurship : Practice and Principles .
Hoboken, NJ:
HarperBusiness.
Gaya MLA
Drucker, Peter, F..
"Innovation And Entre-Preneurship : Practice and Principles".
Hoboken, NJ:
HarperBusiness,
1985.
Textbook.