If you do not have references to any particular works of criticism, you can search in the catalog by the author's name. Enter the name of the author (last name, first name - i.e. Kingston, Maxine Hong), in the search box and search by Subject (not Author).
For Maxine Hong Kingston there are several relevant subject headings that will help you find criticism of her works.
General heading for criticism:
Kingston, Maxine Hong--Criticism and interpretation.
Heading for criticism of particular works:
Kingston, Maxine Hong. Woman warrior.
Headings for books that discuss particular themes in her work:
Kingston, Maxine Hong--Religion.