Landau, L. (1939). Seasonal emigration from Poland to Germany and Latvia. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Landau, Ludwik. Seasonal Emigration from Poland to Germany and Latvia. International Labour Organization, 1939.
Citatione MLA (9a ed.)Landau, Ludwik. Seasonal Emigration from Poland to Germany and Latvia. International Labour Organization, 1939.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.