APA aipamena

Drucker,Peter F. (1999). Management challenges for the 21st century. Butterworth - Heinemann.

Chicago Style aipamena

Drucker,Peter F. Management Challenges for the 21st Century. Oxford: Butterworth - Heinemann, 1999.

MLA aipamena

Drucker,Peter F. Management Challenges for the 21st Century. Butterworth - Heinemann, 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.