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Dyfyniad Arddull Chicago.Goss, R. O., B. M. .Gardner, R.O .Goss, and C.D .Jones. Advances in Maritime Economics. Cambridge ; New York: Cambridge University Press, 1977.
Dyfyniad MLA.Goss, R. O., et al. Advances in Maritime Economics. Cambridge University Press, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.