Citazione Stile APA (7a Edizione)

Kirkpatrick, D. L. (1994). Evaluating training programs: The four levels. Berrett-Koehler.

Citazione stile Chigago Style (17a edizione)

Kirkpatrick, Donald L. Evaluating Training Programs: The Four Levels. San Francisco: Berrett-Koehler, 1994.

Citatione MLA (9a ed.)

Kirkpatrick, Donald L. Evaluating Training Programs: The Four Levels. Berrett-Koehler, 1994.