Johnson, R. (1992). Elementary statistics (6th ed.). Duxbury.
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Dyfyniad Arddull Chicago
Johnson, Robert. Elementary Statistics. 6th ed. Belmont: Duxbury, 1992.
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Dyfyniad MLA
Johnson, Robert. Elementary Statistics. 6th ed. Duxbury, 1992.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.