Engelen-Kefer, U. (1976). Humanisation of work in the Federal Republic of Germany: A labour-oriented approach. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Engelen-Kefer, Ursula. Humanisation of Work in the Federal Republic of Germany: A Labour-oriented Approach. International Labour Organization, 1976.
Citatione MLA (9a ed.)Engelen-Kefer, Ursula. Humanisation of Work in the Federal Republic of Germany: A Labour-oriented Approach. International Labour Organization, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.