If you are just beginning your studies in immigration history or are simply interested in the field, then you should read “From Immigration to Migration Systems: New Concepts in Migration History” by Dirk Hoerder.
This article, from the Organization of American Historians, is aimed at the non-specialist. It is an excellent and brief introduction to the state of immigration studies as existed in 1999. Three aspects stressed by Hoerder are migration systems (which connect two or more societies), the increased study of non-North European migrants and migration systems not centered on the United States. The article closes with several case studies, which would be useful for instructors.
Hoerder, Dirk. “From Immigration to Migration Systems: New Concepts of Migration History,” OAH Magazine of History, Vol, 14, No. 1, Migrations (Fall, 1999), pp. 5-11.
Access the first page of the article here; see if your local library has a JSTOR subscription if you would like to read the rest of the article.