Consider Jackson's longer work, such as The Haunting of Hill House and We Have Always Lived in the Castle.
You might wish to set Jackson's work in the context of historical Gothic novels, such as Ann Radcliffe's The Mysteries of Udolpho or Emily Brontë's Wuthering Heights.
Consider Jackson in the context of her contemporaries, such as J.D. Salinger (Nine Stories) and John Cheever.