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Dyfyniad Arddull ChicagoSchroder, Gerhard, Alfred Rapp, and D. J. S. Thompson. Decision for Europe. London: Thames and Hudson, 1964.
Dyfyniad MLASchroder, Gerhard, et al. Decision for Europe. Thames and Hudson, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.