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Dyfyniad Arddull ChicagoElifson, Kirk W., Richard P. Runyon, and Audrey Haber. Fundamentals of Social Statistics. Second edition. New York: McGraw-Hill, 1990.
Dyfyniad MLAElifson, Kirk W., et al. Fundamentals of Social Statistics. Second edition. McGraw-Hill, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.