Drucker, P. F. (1985). Innovation and entrepreneurship: Practice and principles. William Heinemann.
Citazione stile Chigago Style (17a edizione)Drucker, Peter F. Innovation and Entrepreneurship: Practice and Principles. London: William Heinemann, 1985.
Citatione MLA (9a ed.)Drucker, Peter F. Innovation and Entrepreneurship: Practice and Principles. William Heinemann, 1985.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.