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Dyfyniad Arddull ChicagoHAX ARNOLD C(ED.). PLANNING STRATEGIES THAT WORK. NEW YORK: OXFORD UNIVERSITY PRESS, 1987.
Dyfyniad MLAHAX ARNOLD C(ED.). PLANNING STRATEGIES THAT WORK. OXFORD UNIVERSITY PRESS, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.