Flowers, Ann A. Review. Horn Book, 62 (March/April 1986): 207. Thoughtful, positive review highlighting the book's diverse group of characters and the edgy interaction between Tris and Clem.

"Johnson, Annabel," and "Johnson, Edgar." In Contemporary Authors, New Revision Series. Vol. 33. Detroit: Gale Research, 1991: 253-256.

The only recent widely-available article about this pair of authors.

Contains brief biographies, along with a long list of the books they have written, awards won, and further sources of information. There is some discussion of the Johnsons' place among authors of young adult books.

Klein, Aaron E. Beyond Time and Matter: A Sensory Look at ESP. New York: Doubleday, 1973. An overview of extrasensory perception and the status and problems of research into it.

Although the book is over twenty years old, most of its information is still valid. Written in a clear style which explains the basics and maintains a middle...