The Mabinogi and other Medieval Welsh Tales, translated by Patrick K. Ford.

Berkeley: University of California Press, 1977. These tales are Alexander's sources for his characters.

Weber, Rosemary. "Alexander, Lloyd (Chudley)." In Twentieth Century Children's Writers, edited by D. L. Kirkpatrick. New York: St. Martin's, 1978.

Contains basic information about the author's life and works.