Fantastic Fiction lists Peterson's books and a brief biography.
ThinkQuest Library provides a brief biography of Haddix, and a link to an interview with her about how she became a writer. ThinkQuest also offers an interview with Haddix on her book Running Out of Time
Contemporary Authors Online; which is available online through the public library or to individuals who have a library card.
AUTHORS 4 TEENS.COM has a biography of Haddix and an interview with her, but requires a registration for the information. Please check with your parents or teacher before entering any personal information on this and any web site.
The Literature, Arts and Medicine Databasehas a brief description of Haddix's work along with literature annotations for three of her books.