Search the resources here for definitions and a general overview for your topic.
Search for books using Saint Louis University Libraries' Catalog
To find titles in the catalog do a subject search using the words "English Language -- Study and Teaching -- Foreign Speakers" and narrow down by "Case studies" or "Evaluation".
Still did not locate a specific resource? Try WorldCat, the US union catalog.
Search the following databases for journal articles on your topic.
Use these sources to find definitions and topic overviews.
All these titles are found in the reference collection. You can not check them out but you can use them in the library.