APA (7th ed.) Citation
Kirkpatrick, J. D., & Kayser Kirkpatrick, W. (2016). Four Levels of Training Evaluation. ATD Press.
Chicago Style (17th ed.) Citation
Kirkpatrick, James D., and Wendy Kayser Kirkpatrick. Four Levels of Training Evaluation. Alexandria: ATD Press, 2016.
MLA (9th ed.) Citation
Kirkpatrick, James D., and Wendy Kayser Kirkpatrick. Four Levels of Training Evaluation. ATD Press, 2016.
Warning: These citations may not always be 100% accurate.