(1930). Labour efficiency investigations in English farming. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Labour Efficiency Investigations in English Farming. International Labour Organization, 1930.
Citatione MLA (9a ed.)Labour Efficiency Investigations in English Farming. International Labour Organization, 1930.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.