Osman, O. M. (1958). The social and economic development of the Sudan. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Osman, Omer M. The Social and Economic Development of the Sudan. International Labour Organization, 1958.
Citatione MLA (9a ed.)Osman, Omer M. The Social and Economic Development of the Sudan. International Labour Organization, 1958.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.