Schwartz, D. J. (1987). The magic of thinking big. Simon & Schuster.
Chicago Style aipamenaSchwartz, David Joseph. The Magic of Thinking Big. New York: Simon & Schuster, 1987.
MLA aipamenaSchwartz, David Joseph. The Magic of Thinking Big. Simon & Schuster, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.