//-->
Der Flächenrucksack des europäischen Außenhandels mit Agrarprodukten
Steger, Sören, (2005)
Comparative advantige and U.S. export and imports of farm products : paper prepared for National Agricultural Outlook Conference, Washington, Febr. 23, 1972
Johnson, D. Gale, (1972)
Our foreign agricultural trade
(1966)
D. Gale Johnson : 1916 - 2003
Ruttan, Vernon W., (2004)
Population and economic development
Johnson, David Gale, (1999)