Some of these specicialized bibliographies list selected websites as well as publications.
If a url leads you to "page not found," copy the broken link and paste it into the "Wayback Machine" at http://archive.org/web/web.php Not all websites will be archived. For many websites, the last few entries lead to a page stating that the url is available. Simply try an earlier entry.
And if you would like to suggest a book, article, website or topic that is not covered, please write us at firstname.lastname@example.org