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Dyfyniad Arddull ChicagoPoland, Ursula. World Directory of Biological and Medical Sciences Libraries. München ; New York: K.G. Saur, 1988.
Dyfyniad MLAPoland, Ursula. World Directory of Biological and Medical Sciences Libraries. K.G. Saur, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.