Dyfyniad APA

Langbein, L. I. (1980). Discovering whether programs work: A guide to statistical methods for program evaluation. Goodyear Pub.

Dyfyniad Arddull Chicago

Langbein, Laura Irwin. Discovering Whether Programs Work: A Guide to Statistical Methods for Program Evaluation. Santa Monica, California: Goodyear Pub, 1980.

Dyfyniad MLA

Langbein, Laura Irwin. Discovering Whether Programs Work: A Guide to Statistical Methods for Program Evaluation. Goodyear Pub, 1980.

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