Perner, Josef MPI for Psychological Research (Munich, -2003), The Prior Institutes, Max Planck Institute for Human Cognitive and Brain Sciences, Max Planck Society;
Wimmer, H., Gruber, S., & Perner, J. (1984). Young Childrens Conception of Lying - Lexical Realism Moral Subjectivism. Journal of Experimental Child Psychology, 37(1), 1-30.