Drucker, P. F. (1992). Managing For the Future: The 1990's and Beyond. McGraw-Hill.
Dyfyniad Arddull ChicagoDrucker, Peter F. Managing For the Future: The 1990's and Beyond. New Delhi: McGraw-Hill, 1992.
Dyfyniad MLADrucker, Peter F. Managing For the Future: The 1990's and Beyond. McGraw-Hill, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.