1. LSF - Learning for a Sustainable Future (2014) Connecting the dots. Key strategies that transform learning for environmental education, citizenship and sustainability. Online: http://lsf-lst.ca/dots , accessed on September 29, 2014
2. Sterling, Stephen (2013) UNICA Report. http://www.unica-network.eu/sites/default/files/Brochure%20MEP%20ugaf%20A5%20bat5.pdf
3. UNESCO (2005) Education for sustainable development (ESD). Online: http://www.unesco.org/new/en/education/themes/leading-the-international-agenda/education-for-sustainable-development/ , accessed on September 29, 2014
4. WBGU (2011) World in transition. A social contract for sustainability. http://www.wbgu.de/fileadmin/templates/dateien/veroeffentlichungen/hauptgutachten/jg2011/wbgu_jg2011_kurz_en.pdf , accessed on September 24, 2014