Não informado. (1992). Professional Manager. Institute of Management Foundation.
Chicago-Zitierstil (17. Ausg.)Não informado. Professional Manager. London: Institute of Management Foundation, 1992.
MLA-Zitierstil (8. Ausg.)Não informado. Professional Manager. Institute of Management Foundation, 1992.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.