Gaya APA

Kirkpatrick, D, L., Kirkpatrick, J, D. (2006). Evaluating Training Programs, Third Edition: The Four Levels (Third Edition). California: Berrett-Koehler.

Gaya MLA

Kirkpatrick, Donald, L.., Kirkpatrick, James, D.. "Evaluating Training Programs, Third Edition: The Four Levels". Third Edition California: Berrett-Koehler, 2006. Book.