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.