Baka, W. (1999). The origins of transformation of the system. Olympus - Centre for Education and Business Development.
Citazione stile Chigago Style (17a edizione)Baka, Władysław. The Origins of Transformation of the System. Warsaw: Olympus - Centre for Education and Business Development, 1999.
Citatione MLA (9a ed.)Baka, Władysław. The Origins of Transformation of the System. Olympus - Centre for Education and Business Development, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.