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Dyfyniad Arddull ChicagoRazeghi, Andrew. Hope: How Triumphant Leaders Create the Future. San Francisco: Jossey-Bass, 2006.
Dyfyniad MLARazeghi, Andrew. Hope: How Triumphant Leaders Create the Future. San Francisco: Jossey-Bass, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.