Behrens, W., Hawranek, P. M., & United Nations Industrial Development Organization. (1991). Manual for the preparation of industrial feasibility studies (Newly rev. and expanded ed.). Vienna: United Nations Industrial Development Organization.
Παραπομπή Chicago StyleBehrens, W., P. M. Hawranek, and United Nations Industrial Development Organization. Manual for the Preparation of Industrial Feasibility Studies. Newly rev. and expanded ed. Vienna: United Nations Industrial Development Organization, 1991.
Παραπομπή MLABehrens, W., P. M. Hawranek, and United Nations Industrial Development Organization. Manual for the Preparation of Industrial Feasibility Studies. Newly rev. and expanded ed. Vienna: United Nations Industrial Development Organization, 1991.