Nelson, G. O. (1970). Improving the effectiveness of food aid . G.O. Nelson. Agricultural Development Council.
Lua i Stíl Chicago (17ú heag.)Nelson, Gordon O. Improving the Effectiveness of Food Aid . G.O. Nelson. New York: Agricultural Development Council, 1970.
Lua MLA (9ú heag.)Nelson, Gordon O. Improving the Effectiveness of Food Aid . G.O. Nelson. Agricultural Development Council, 1970.
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