Aha! The Moments of Insight that Shape Our World (2015). New York: Oxford University Press.

The 'tijdschrift Persoonsgerichte experiëntiële Psychotherapie' (tPeP) is the journal of the Dutch Society for Client-Centered Psychotherapy and the Flemish Society for Client-Centered/Experiential Psychotherapy and Counseling. It is issued four times a year, in February, May, August and November.