Conference Board & Bursk, E. C. (1973). Challenge to leadership: Managing in a changing world. Free Press.
Citazione stile Chigago Style (17a edizione)Conference Board e Edward Collins Bursk. Challenge to Leadership: Managing in a Changing World. New York: Free Press, 1973.
Citatione MLA (9a ed.)Conference Board e Edward Collins Bursk. Challenge to Leadership: Managing in a Changing World. Free Press, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.