Dyfyniad APA

Johnson, R. (1984). Elementary statistics (Fourth edition.). Duxbury Press.

Dyfyniad Arddull Chicago

Johnson, Robert. Elementary Statistics. Fourth edition. Boston: Duxbury Press, 1984.

Dyfyniad MLA

Johnson, Robert. Elementary Statistics. Fourth edition. Duxbury Press, 1984.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.