Brown, H. (1954). The challenge of man's future: An inquiry concerning the condition of man during the years that lie ahead. New York: Viking Press.
Παραπομπή Chicago StyleBrown, Harrison. The Challenge of Man's Future: An Inquiry Concerning the Condition of Man During the Years That Lie Ahead. New York: Viking Press, 1954.
Παραπομπή MLABrown, Harrison. The Challenge of Man's Future: An Inquiry Concerning the Condition of Man During the Years That Lie Ahead. New York: Viking Press, 1954.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.