Possession Illustrated
https://www.english.cam.ac.uk/cambridgeauthors/byatt-possession-illustrated/
This webpage features images and information about Victorian visual art associated with the novel.
Letters Between Elizabeth Barrett Browning and Robert Browning
http://digitalcollections.baylor.edu/cdm/landingpage/collection/ab-letters
The relationship between the poets Elizabeth Barrett Browning and Robert Browning serves as one of the key inspirations for the relationship between Randolph and Christabel, particularly the way in which they used letters to develop their relationship. This website includes images of the originals as well as transcriptions of the content.
Reviews of Possession
http://www.complete-review.com/reviews/byattas/possess.htm
This website contains a list of, and links to, all major reviews of the novel, as well as a list of A.S Byatt's other books.
A.S Byatt Homepage
The official author page for A.S Byatt includes biography, bibliography, and a collection of links, many of which are related to Possession.
Reading Guide
https://www.penguinrandomhouse.com/books/22383/possession-by-as-byatt/9780679735908/readers-guide/
This website contains reflection questions to enhance discussion of the novel, as well as a list of poems that provide helpful context for the novel.