Gaya APA
Kirkpatrick, D, L. (1996).
EVALUATING TRAINING PROGRAMS: The Four Levels .
San Francisco:
Berret-Koehler Publishers, Inc.
Gaya MLA
Kirkpatrick, Donald, L.
"EVALUATING TRAINING PROGRAMS: The Four Levels".
San Francisco:
Berret-Koehler Publishers, Inc,
1996.
Books.