Hultgren, T. (1965). Cost, prices, and profits, their cyclical relations. National Bureau of Economic Research.
Lua i Stíl Chicago (17ú heag.)Hultgren, Thor. Cost, Prices, and Profits, Their Cyclical Relations. New York: National Bureau of Economic Research, 1965.
Lua MLA (9ú heag.)Hultgren, Thor. Cost, Prices, and Profits, Their Cyclical Relations. National Bureau of Economic Research, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.