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Dyfyniad Arddull ChicagoStudy of Parliament Group. Parliament and Pressure Politics. Oxford [England]: Clarendon Press, 1990.
Dyfyniad MLAStudy of Parliament Group. Parliament and Pressure Politics. Clarendon Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.