Gaya APA
Kirkpatrick, D, L. (1998).
Evaluating Training Programs The Four Levels 2'nd Ed. (2).
San Fransisco:
Berret -Koehler Publishers.
Gaya MLA
Kirkpatrick, Donald, L..
"Evaluating Training Programs The Four Levels 2'nd Ed.".
2
San Fransisco:
Berret -Koehler Publishers,
1998.
Text.