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Dyfyniad Arddull ChicagoReeve, Roger N. Introduction to Environmental Analysis. West Sussex: John Wiley and sons Lts, 2002.
Dyfyniad MLAReeve, Roger N. Introduction to Environmental Analysis. John Wiley and sons Lts, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.