Bordages, Asa. "Joseph Krumgold." In Newbery and Caldecott Medal Books, 1956-1965, edited by Lee Kingman.

Boston: Horn Book, 1965. This article provides biographical information as well as a detailed description of Krumgold's hometown, Hope, New Jersey.

Krumgold, Joseph. "Archetypes of the Twentieth Century." School Library Journal (October 1968): 112-115.

Krumgold explains the relationship between And Now Miguel, Onion John, and Henry 3, and compares these stories to well known fairy tales. This article gives an excellent summary of the themes of his novels.

"Newbery Award Acceptance." In Newbery and Caldecott Medal Books, 1956-1965, edited by Lee Kingman.

Boston: Horn Book, 1965. This speech explains Krumgold's philosophy about writing and gives the background for the writing of Onion John.