Jacobs, William Jay. "John R. Tunis: A Commitment to Values." In Authors and Illustrators of Children's Books.

New York: Bowker, 1972. A brief but solid account of Tunis's main ideas and techniques.

Tunis, John R. A Measure of Independence. New York: Atheneum, 1964. An engaging autobiography that projects the essence of Tunis's agreeable demeanor and his strong convictions.

Weidman, Jerome. Horn Book 44 (February 1968): 68-71. Reminiscence about the author's contact with Tunis, followed by a brief review of His Enemy, His Friend.