Journal of sea research, Vol.17(1)1983.
Dyfyniad Arddull ChicagoJournal of Sea Research, Vol.17(1)1983.
Dyfyniad MLAJournal of Sea Research, Vol.17(1)1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
Journal of sea research, Vol.17(1)1983.
Dyfyniad Arddull ChicagoJournal of Sea Research, Vol.17(1)1983.
Dyfyniad MLAJournal of Sea Research, Vol.17(1)1983.