Dyfyniad APA

Christensen, H. B. (1977). Statistics step by step. Houghton.

Dyfyniad Arddull Chicago

Christensen, Howard B. Statistics Step by Step. Atlanta: Houghton, 1977.

Dyfyniad MLA

Christensen, Howard B. Statistics Step by Step. Houghton, 1977.

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