Lua APA (7ú heag.)

.Drucker, P. F. (2000). Management challenges for the 21st century. Butterworth-Heinemann.

Lua i Stíl Chicago (17ú heag.)

.Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 2000.

Lua MLA (9ú heag.)

.Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 2000.

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