Northanger Abbey E-Text
http://etext.virginia.edu/toc/modeng/public/AusNort.html
Provides a full-length digital text of the novel, broken down by chapter. Handy for quick reference.
Northanger Abbey Historical Background
http://www.vanderbilt.edu/AnS/english/English151W-03/austen%5Bnaplot%5D.htm
A brief overview of the novel and historical background, written by a professor at Vanderbilt University.
Jane Austen: Publication History
http://www.questia.com/PM.qst?a=o&docId=1090241
Summarizes the publication history of Northanger Abbey, which Austen's brother Henry published after his sister's death.
The Gothic Novel
http://cai.ucdavis.edu/waters-sites/gothicnovel/155breport.html
Traces the development of the Gothic novel as a genre and explains Austen's relation to the genre.
Northanger Abbey in Film
http://www.pbs.org/wgbh/masterpiece/austen/resources.html
Provides a preview of the film adaptation of Northanger Abbey, as well as extensive links to biographical websites on Jane Austen.