APA Format
Downs, Robert B. (1956).
Books that changed the world / by Robert B. Downs
. New York :: New American Library,.
MLA Format
Downs, Robert B.
Books that changed the world / by Robert B. Downs
. New York :: New American Library,, 1956
Chicago Format
Downs, Robert B. Books that changed the world / by Robert B. Downs. New York :: New American Library,, 1956.