Hempel, F. (2010). Voluntary insurance provisions in national social security schemes: Unilateral actions of the countries of origin: contribution to the MIGSEC project Extending the social security rights of African migrant workers. International Labour Organization.
Citazione stile Chigago Style (17a edizione)Hempel, Frank. Voluntary Insurance Provisions in National Social Security Schemes: Unilateral Actions of the Countries of Origin: Contribution to the MIGSEC Project Extending the Social Security Rights of African Migrant Workers. International Labour Organization, 2010.
Citatione MLA (9a ed.)Hempel, Frank. Voluntary Insurance Provisions in National Social Security Schemes: Unilateral Actions of the Countries of Origin: Contribution to the MIGSEC Project Extending the Social Security Rights of African Migrant Workers. International Labour Organization, 2010.