Brown, H. S. (1954). The challenge of man's future: An inquiry concerning the condition of man during the years that lie ahead. Viking Press.
Chicago-referens (17:e uppl.)Brown, Harrison Scott. The Challenge of Man's Future: An Inquiry Concerning the Condition of Man During the Years That Lie Ahead. New York: Viking Press, 1954.
MLA-referens (9:e uppl.)Brown, Harrison Scott. The Challenge of Man's Future: An Inquiry Concerning the Condition of Man During the Years That Lie Ahead. Viking Press, 1954.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.