1. United Nations Conference on Environment & Development Rio de Janerio, Brazil, 3 to 14 June 1992, Agenda 21https://sustainabledevelopment.un.org/content/documents/Agenda21.pdf
2. Our Common Future, Report of the World Commission on Environment and Developmenthttp://www.un-documents.net/our-common-future.pdf
3. Issues and Trends in Education for Sustainable Development,2018
4. Transformational sustainability research methodology;Wiek,2016
5. Educating for Sustainability: Competencies & Practices for Transformative Action;Frisk;J. Sustain. Educ.,2011