Drucker, P. (1992). Managing for the future: The 1990s and beyond. TMH.
Chicago Style aipamenaDrucker, Peter. Managing for the Future: The 1990s and Beyond. New delhi: TMH, 1992.
MLA aipamenaDrucker, Peter. Managing for the Future: The 1990s and Beyond. TMH, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.