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 32 (januar 1, 1968). Set december 7, 2025. https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/34464.