1. Armon, C. (1984). Ideals of the good life and moral judgment: Ethical reasoning across the life span. In M. L. Commons, F. A. Richards & C. Armon (Eds.), Beyond formal operations: Late adolescent and adult cognitive development (pp. 357–380). New York, Praeger.
2. Atwood, M. E., & Polson, P. G. (1976). A process model for water jug problems. Cognitive Psychology, 8, 191–216.
3. Bakracevic Vukman, K. (2000). Razvoj misljenja v odrasli dobi (Development of thought in adulthood), Maribor, PeF.
4. Bakracevic Vukman, K. (2001). Developmental aspects of metacognition in ill-defined problem solving. Paper presented at the 9th EARLI Conference, Fribourg, Switzerland.
5. Baltes, P. B., & Staudinger, U. M. (1994). Psychology of wisdom. In R. J. Sternberg (Ed.), Encyclopedia of human intelligence (Vol.2, 1143–1152). New York: MacMillan.