1. Biggs, J. B., & Collis, K. F. (1982). Evaluating the quality of learning: The SOLO taxonomy. New York: Academic Press.
2. Biggs, J. B., & Tang, C. (2007). Teaching for quality learning at university (3rd ed.). Maidenhead: McGraw Hill Education, Open University Press.
3. Boons, F., Spekkink, W., & Mouzakitis, Y. (2011). The dynamics of industrial symbiosis: a proposal for a conceptual framework based upon a comprehensive literature review. Journal of Cleaner Production, 19(9), 905–911.
4. Braungart, M., & McDonough, W. (2002). Cradle to cradle. Remaking the way we make things. New York: North Point Press.
5. Brunner, P. H., & Rechberger, H. (2005). Practical handbook of material flow analysis. Boca Raton: Lewis Publishers.