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Dyfyniad Arddull ChicagoPearson, E.S. Studies in the History of Statistics and Probability. London: Griffin, 1970.
Dyfyniad MLAPearson, E.S. Studies in the History of Statistics and Probability. Griffin, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.