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Dyfyniad Arddull ChicagoWeingand, Darlene E. Marketing/planning Library and Information Services. Littleton, Colo.: Libraries Unlimited, 1987.
Dyfyniad MLAWeingand, Darlene E. Marketing/planning Library and Information Services. Libraries Unlimited, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.