Não informado. (1964). International agricultural development. International Agricultural Development Service.
Chicago-referens (17:e uppl.)Não informado. International Agricultural Development. Washington: International Agricultural Development Service, 1964.
MLA-referens (8:e uppl.)Não informado. International Agricultural Development. International Agricultural Development Service, 1964.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.