1. Aiken, L. S., & West, S. G. (1993). Multiple regression: testing and interpreting interactions. Newbury Park: Sage.
2. Alexander, P. A., Jetton, T. L., & Kulikowich, J. M. (1995). Interrelationship of knowledge, interest, and recall: assessing a model of domain learning. Journal of Educational Psychology, 87(4), 559–575.
3. Baram-Tsabari, A., & Yarden, A. (2009). Identifying meta-clusters of students’ interest in science and their change with age. Journal of Research in Science Teaching, 46(9), 999–1022.
4. Bergin, D. A. (1999). Influences on classroom interest. Educational Psychologist, 34(2), 87–98.
5. Bickel, M., & Bögeholz, S. (2013a). Landwirtschaft als Bildungsgegenstand: Lernziele, Lerngelegenheiten auf Schulbauernhöfen, Schülerinteressen und Lernpotentiale [Agriculture as object in education: learning goals, learning opportunities on school farms, students’ interests and learning potentials]. In D. Haubenhofer & I. Strunz (Eds.), Raus auf's Land - Landwirtschaftliche Betriebe als zeitgemäße Erfahrungs- und Lernorte für Kinder und Jugendliche [Going to the countryside - Agricultural enterprises as modern places of experience and learning for children and adolescents] (pp. 117–138). Baltmannsweiler, Germany: Schneider Hohengehren.