Lua APA (7ú heag.)

Drucker, P. F. (1999). Management challenges for the 21st century (First edition.). HarperBusiness.

Lua i Stíl Chicago (17ú heag.)

Drucker, Peter F. Management Challenges for the 21st Century. First edition. New York: HarperBusiness, 1999.

Lua MLA (8ú heag.)

Drucker, Peter F. Management Challenges for the 21st Century. First edition. HarperBusiness, 1999.

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