Miller, Bertha M., and Elinor W. Field, eds. Newbery Medal Books 19221955. Boston: Horn Book 1955. Contains a brief autobiographical comment by Kelly on his work, followed by some reflections on his retirement. Also includes a kind of poetic tribute to Krakow and its lasting effect on the author, "The City that Sings."

Serraillier, Ian. The Silver Sword. 1956.

Reprinted as Escape from Warsaw.

New York: Scholastic, 1972. A wellknown and much-praised account of young people facing the difficulties of life in Poland during World War II.