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Dyfyniad Arddull ChicagoEpstein, Leon D., et al. Political Research and Political Theory. Cambridge, Mass: Harvard University Press, 1968.
Dyfyniad MLAEpstein, Leon D., et al. Political Research and Political Theory. Harvard University Press, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.