APA引文

Drucker. (2009). Innovation and entrepreneurship: Practice and principles. Elsevier.

Chicago Edition Citation

Drucker. Innovation and Entrepreneurship: Practice and Principles. UP: Elsevier, 2009.

MLA引文

Drucker. Innovation and Entrepreneurship: Practice and Principles. Elsevier, 2009.

警告：這些引文格式不一定是100％准確.