APA
Nygaard D., . (1981). Risk and allocative arrors due to imperfect information: the impact of wheat technology in Tunisia. Washington-US: United States Agency for International Development.
Chicago
Nygaard D.F, . 1981. Risk and allocative arrors due to imperfect information: the impact of wheat technology in Tunisia. Washington-US: United States Agency for International Development.
Harvard
Nygaard D., . (1981). Risk and allocative arrors due to imperfect information: the impact of wheat technology in Tunisia. Washington-US: United States Agency for International Development.
MLA
Nygaard D.F, . Risk and allocative arrors due to imperfect information: the impact of wheat technology in Tunisia. Washington-US: United States Agency for International Development. 1981.