Hultgren, T. (1965). Cost, prices, and profits, their cyclical relations. National Bureau of Economic Research.
Chicago-referens (17:e uppl.)Hultgren, Thor. Cost, Prices, and Profits, Their Cyclical Relations. New York: National Bureau of Economic Research, 1965.
MLA-referens (9:e uppl.)Hultgren, Thor. Cost, Prices, and Profits, Their Cyclical Relations. National Bureau of Economic Research, 1965.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.