Authors and Artists for Young Adults, vol. 4.

Detroit, Gale, 1990. A biographical essay about Paula Danziger.

Children's Books and Their Creators. Boston: Houghton Mifflin Co., 1995. Contains information about Ann M. Martin.

Children's Literature Review, vol. 20. Detroit: Gale, 1990. Contains information about Paula Danziger's books.

Comerford, Lynda Drill Lynda. "A True Test of Friendship: Epistolary Fiction Written by Ann M. Martin and Paula Danziger."

Publishers Weekly (March 9, 1998): 26.

An article about the challenges of coauthoring books.

Contemporary Authors, vol. 115. Detroit: Gale, 1985. A biographical essay detailing Paula Danziger's life and work.

Contemporary Authors, New Revision Series, vol. 32. Detroit: Gale, 1991. A biographical essay detailing Ann M. Martin's life and work.

Contemporary Literary Criticism, vol. 21.

Detroit: Gale, 1982. A compilation of reviews relating to Paula Danziger's work.

Elders, Ann. Review of P.S. Longer Letter Later. School Library Journal (July 1999): 54.

Koertge, Ron. "Please Mr. Postman." New York Times Book Review (May 17, 1998): 27. A...