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Dyfyniad Arddull ChicagoPlas, N.C. Van Der. Ring Transformations of Hectrocycles. London: Academic Press, 1973.
Dyfyniad MLAPlas, N.C. Van Der. Ring Transformations of Hectrocycles. Academic Press, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.