Dyfyniad APA

Urwick, L. (1957). Leadership in the twentieth century. Sir Isaac pitman.

Dyfyniad Arddull Chicago

Urwick, L.F. Leadership in the Twentieth Century. London: Sir Isaac pitman, 1957.

Dyfyniad MLA

Urwick, L.F. Leadership in the Twentieth Century. Sir Isaac pitman, 1957.

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