APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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