O.H, .-. Kaplan, Jacob J., The Challenge of Foreign Aid - Policies, Problems, and Possibilities, Frederick A. Praeger, New York, 1967 (andra tryckn. 1968) - Praeger Series on International Economics and Development. Ledelse og Erhvervsøkonomi, [S. l.], v. 32, 1968. Disponível em: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/34464. Acesso em: 24 maj. 2024.