- Powell's Books is the largest independent used and new bookstore in the world. We carry an extensive collection of out of print rare, and technical titles as well as many other new and used books in every field.www.powells.com/authors/higginsclark.html
- A Conversation With Mary Higgins Clark By Claire E. White -- The Internet Writing Journal(R) ...www.writerswrite.com/journal/may00/clark.htm
- Book review site filled with extremely detailed description of plots, settings, characters, and themes.allreaders.com/books/mary-higgins-clark-154