Não informado. (1933). Farm Economist. University of Oxford, Agricultural Economics Research Institute.
Chicago (17e ed.) BronvermeldingNão informado. Farm Economist. Oxford, Inglaterra: University of Oxford, Agricultural Economics Research Institute, 1933.
MLA (8e ed.) BronvermeldingNão informado. Farm Economist. University of Oxford, Agricultural Economics Research Institute, 1933.
Let op: Deze citaties zijn niet altijd 100% accuraat.