«Rezension: Kirkpatrick, Donald L./Kirkpatrick, James D. (2006): Evaluating training programs: The four levels. 3rd edition.»

Beywl, Wolfgang (2009): «Rezension: Kirkpatrick, Donald L./Kirkpatrick, James D. (2006): Evaluating training programs: The four levels. 3rd edition.». In: Zeitschrift für Evaluation. (1). S. S. 127-130.