Emily Brontë -- Stevie Davies
"...a new series of innovative critical studies introducing writers and their contexts to a wide range of readers. Drawing upon the mast recent thinking in English studies, each book considers biographical material, examines recent criticism, includes a detailed bibliography, and offers a concise but challenging reappraisal of a writer's major work."
Emily Bronte (Dodo Press) -- A. Mary F. Robinson
Emily Brontë: her life and work -- Muriel Spark, Derek Stanford
Also read up on her other work which is a collection of poems. They provide some insight into her psyche, since there is little information on her.
The poems of Emily Brontë -- Emily Bronte