Wong, W. Y. (2002). Waste management towards sustainability [master's thesis, The University of Hong Kong]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0029-1812201200000027
Eneh, A. E., & Oluigbo, S. N. (2012). Mitigating the Impact of Climate Change through Waste Recycling. Research Journal of Environmental and Earth Sciences, 4(8), 776-781. https://www.airitilibrary.com/Article/Detail?DocID=20410492-201208-201507210039-201507210039-776-781