Kurtz, N. R. (1983). Introduction to social statistics. Mc Graw-Hill Book Company.
Dyfyniad Arddull ChicagoKurtz, Norman R. Introduction to Social Statistics. London: Mc Graw-Hill Book Company, 1983.
Dyfyniad MLAKurtz, Norman R. Introduction to Social Statistics. Mc Graw-Hill Book Company, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.