Não informado. (1933). Farm Economist. University of Oxford, Agricultural Economics Research Institute.
Chicago-viite (17. p.)Não informado. Farm Economist. Oxford, Inglaterra: University of Oxford, Agricultural Economics Research Institute, 1933.
MLA-viite (8. p.)Não informado. Farm Economist. University of Oxford, Agricultural Economics Research Institute, 1933.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.