There are several useful books series covering various topics in American Literature.
Search the library catalog for "cambridge companion to" or "oxford companion to" [title keyword search] to find a list of books from these reference series.
Overviews familiarize you with the characters, setting, literary elements, and genre of the work. Overviews can be helpful and informative, but they are not criticism.
You can find overviews at Spark Notes and in a database called Magill On Literature. See Finding Articles for instructions.
NOTE: With few exceptions, overviews and reference books are tertiary sources and should not appear in your Works Cited.
The Continuum Encyclopedia of American Literature
by
Steven Serafin (Editor); Alfred Bendixen (Editor)
From John Smith to Jack Kerouac, Cotton Mather to Toni Morrison, Edgar Allan Poe to Stephen King, Francis Parkman to Alex Haley, the story of American literature is really many stories - of ancient indigenous peoples, early settlers, men and women enslaved and liberated, war and peace, and immigrants seeking better lives. America's multifaceted literary heritage reflects its deepest spiritual and material consciousness: rooted and rootless, rural and urban, timeless and ever-changing. Through a living literature, one comes to learn one's orientations, aspirations, and worldviews: where we have come from and where we may be going.More than ten years in the making, this comprehensive single-volume literary survey is for the student, scholar, and general reader. The Continuum Encyclopedia of American Literature represents a collaborative effort, involving 300 contributors from across the United States and Canada. Composed of more than 1,100 signed biographical-critical entries, this Encyclopedia serves as both guide and companion to the study and appreciation of American literature.
Almanac of British and American Literature
by
John O. Stark
The Hutchinson Encyclopedia of Literature
A comprehensive encyclopedia covering various topics in literature reference.