APA Style
Kirkpatrick, J, D., Kirkpatrick, W, K. (2016).
Kirkpatrick's four levels of training evaluation .
Alexandria, VA ::
ATD Press.
MLA Style
Kirkpatrick, James, D.., Kirkpatrick, Wendy, Kayser.
"Kirkpatrick's four levels of training evaluation".
Alexandria, VA ::
ATD Press,
2016.
Text.