Spina, V. (1997). Success 2000 : moving into the millennium with: Purpose, power, and prosperity. Wiley.
Citazione stile Chigago Style (17a edizione)Spina, Vicki. Success 2000 : Moving into the Millennium with: Purpose, Power, and Prosperity. New york: Wiley, 1997.
Citatione MLA (9a ed.)Spina, Vicki. Success 2000 : Moving into the Millennium with: Purpose, Power, and Prosperity. Wiley, 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.