See especially the six book reviews. By Prof. Robert Butler. Holden Caulfield is used as an example.
Most essays are by students.
The Haunted Life of J.D. Salinger By Ron Rosenblaum, in Esquire magazine Reprints articles from scholarly journals back to 1970. See your teacher for authorization number and password. Some of the free home pages on GeoCities are worthwhile, some not. Yahoo's links are usually worthwhile. Salinger books currently in print.