Freeman, R., & Schettkat, R. (2000). Low wage services: Interpreting the US-German difference. National Bureau of Economic Research.
Citazione stile Chigago Style (17a edizione)Freeman, Richard, e Ronald Schettkat. Low Wage Services: Interpreting the US-German Difference. Cambridge: National Bureau of Economic Research, 2000.
Citatione MLA (9a ed.)Freeman, Richard, e Ronald Schettkat. Low Wage Services: Interpreting the US-German Difference. National Bureau of Economic Research, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.