Kennedy, P. M. (1994). Preparing for the twenty-first century (First Vintage Books edition.). Vintage Books.
Dyfyniad Arddull ChicagoKennedy, Paul M. Preparing for the Twenty-first Century. First Vintage Books edition. New York: Vintage Books, 1994.
Dyfyniad MLAKennedy, Paul M. Preparing for the Twenty-first Century. First Vintage Books edition. Vintage Books, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.