Fretwell, D. (1993). Developing effective employment services. World Bank.
Citazione stile Chigago Style (17a edizione)Fretwell, David. Developing Effective Employment Services. Washington, D.C: World Bank, 1993.
Citatione MLA (9a ed.)Fretwell, David. Developing Effective Employment Services. World Bank, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.