1. Adjarko, H., Osei-Poku, G., & Ayarkwa, J. (2014). Challenges to the incorporation of environmental sustainability issues into construction procurement at the local government level of Ghana. International Refereed Journal of Engineering and Science (IRJES), 3(11), 42–52.
2. Akbiyikli, R., Eaton, D., & Dikmen, S. U. (2012). Achieving sustainable construction within private finance initiative (PFI) road projects in the UK. Technological and Economic Devolepment of Economy, 18(2), 207–229. https://doi.org/10.3846/20294913.2012.677586
3. Augenbroe, G. L. M., Pearce, A. R., Guy, B., & Kibert, C. K. (1998). Sustainable construction in the USA
4. a perspective to the year 2010. Sust. Dev. and the Future of Constr., vol. report, 225.
5. Ayirebi-Dansoh, J. A., & Amoah, P. (2010). Barriers to implementation of EMS in construction industry in Ghana. Int. J. Eng. Sci. http://hdl.handle.net/123456789/1268.