Johnson, R. R. (1976). Elementary statistics (2nd ed.). Duxbury.
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Dyfyniad Arddull Chicago
Johnson, Robert R. Elementary Statistics. 2nd ed. Massachusetts: Duxbury, 1976.
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Dyfyniad MLA
Johnson, Robert R. Elementary Statistics. 2nd ed. Duxbury, 1976.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.