1. Sustainable organizations: Evaluating the environmental sustainability of schools and companies in a Regional Centre of Expertise;Ofei-Manu;Int. J. Environ. Cult. Econ. Soc. Sustain.,2012
2. Education for Sustainable Development Toolkit;McKeown,2002
3. Business Simulation for Education and Training on Sustainability Managemenhttp://isdrc17.ei.columbia.edu/sitefiles/file/isdrs%20Newsletter%201%202011%20.pdf
4. http://www.unescobkk.org/fileadmin/user_upload/apeid/Conference/14th_Conference/docs/papers/Zainal_Sanusi_RCE_Penang_01.pdf
5. ‘Envisioning, coordinating and implementing the UN Decade of Education for Sustainable Development’ in UNESCO;Richmond,2010