APA (7th ed.) Citation

Kirkpatrick, D. L. (1998). Evaluating training programs: The four levels (2nd ed.). Berrett-Koehler Pubs..

Chicago Style (17th ed.) Citation

Kirkpatrick, Donald L. Evaluating Training Programs: The Four Levels. 2nd ed. San Francisco, Calif.: Berrett-Koehler Pubs., 1998.

MLA (8th ed.) Citation

Kirkpatrick, Donald L. Evaluating Training Programs: The Four Levels. 2nd ed. Berrett-Koehler Pubs., 1998.