The specific subject search in SOLO is
Foreign workers -- Legal status, laws, etc
to which you might want to add the name of a jurisdiction
Migrants at Work : immigration and vulnerability in labour law by 
Race, Gender and Contemporary International Labor Migration Regimes by 
Migrant Rights at Work: law's precariousness at the intersection of immigration and labour by 
Temporary Labour Migration in the Global Era by Open access and available to all:
Children, Human Rights and Temporary Labour Migration by