1. Aalborg Charter (1994). Retrieved May 15, 2006, from http://www.aalborgplus10.dk/default.aspx?m=2&i=336
2. Astleithner, F., Hamedinger, A., Holman, N., & Rydin, Y. (2004). Institutions and indicators—the discourse about indicators in the context of sustainability. Journal of Housing and the Built Environment, 19, 7–24.
3. Atkinson, G., Dubourg, R., Hamilton, K., Munasinghe, M., Pearce, D., & Young, C. (1997). Measuring sustainable development: Macroeconomics and the environment. Cheltenham: Edward Elgar.
4. Berger-Schmitt, R. (2001). Dimensions, indicators and time series in a European system of social indicators by example. (EuReporting Working Paper No. 16. Mannheim: ZUMA).
5. Berger-Schmitt, R., & Noll, H. (2000). Conceptual framework and structure of a European system of social indicators. (EuReporting Working Paper No. 9. Mannheim: ZUMA).