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Dyfyniad Arddull ChicagoFurth, Peter Gregory. Data Analysis for Bus Planning and Monitoring. Washington, D.C: National Academy Press, 2000.
Dyfyniad MLAFurth, Peter Gregory. Data Analysis for Bus Planning and Monitoring. National Academy Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.