Agosta, Lucien L. Howard Pyle. New York: G. K. Hall, 1987. A critical study of Pyle's books for young adults that includes a scholarly discussion of the author's life and artistic contributions.

Agosta gives significant attention to Otto of the Silver Hand in his chapter on Pyle's historical fiction.

Bingham, Jane M., ed. Writers for Children. New York: Charles Scribner's Sons, 1988. The entry on Pyle concentrates on his overall contribution to children's literature.

Children's Literature Association Quarterly 8 (Summer 1983). "Howard Pyle Commemorative" edition, marking the publication centennial of The Merry Adventures of Robin Hood. A collection of critical essays on Pyle's life, career, and works.

Estes, Glenn E., ed. The Dictionary of Literary Biography. Vol. 42, American Writers for Children Before 1900.

Detroit: Gale Research, 1985. A discussion of Pyle's contributions to children's literature.