Böhning, W. R. (1980). Guest worker employment with special reference to the Federal Republic of Germany, France, and Switzerland: Lessons for the United States? College Park, Md.: Center for Philosophy and Public Policy, University of Maryland.

Böhning, W. R. Guest Worker Employment With Special Reference to the Federal Republic of Germany, France, and Switzerland: Lessons for the United States? College Park, Md.: Center for Philosophy and Public Policy, University of Maryland, 1980.

Böhning, W. R. Guest Worker Employment With Special Reference to the Federal Republic of Germany, France, and Switzerland: Lessons for the United States? College Park, Md.: Center for Philosophy and Public Policy, University of Maryland, 1980.