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Dyfyniad Arddull ChicagoGETTY J PAUL. HOW TO BE A SUCCESSFUL EXECUTIVE. LONDON: STARBOOK, 1982.
Dyfyniad MLAGETTY J PAUL. HOW TO BE A SUCCESSFUL EXECUTIVE. STARBOOK, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.