Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

Langbein, Laura Irwin. Discovering Whether Programs Work: A Guide to Statistical Methods for Program Evaluation. Glenview, Il: Scott, Foresman, 1980.

Citatione MLA (9a ed.)

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