1. Houng, H., Shen, S.-H., Ma, H.-K. (2014). Municipal solid waste management in Taiwan: From solid waste to sustainable material management. In Municipal solid waste management in Asia and the Pacific Islands (pp. 317–336). Singapore: Springer.
http://www.springer.com/environment/pollution+and+remediation/book/978-981-4451-72-7
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2. Ma, H.-K. (2013.06). Waste Reduction and resource recycling in Taipei City. 2013 Taipei-Hong Kong City Forum, Taipei, Taiwan, June 7, 2013 (invited speaker).
3. Ma, H.-K. (2016.06). Eco-recycling of precious metal from e-waste. 4th annual E-waste World 2016, Shanghai, China (invited speaker).
4. Ma, H.-K. (2014.04). Integrated and plastic waste management in Taiwan. In 2014 International Symposium of “I Act, U Act!”, Education for Plastic Waste Recycling at IEd Environmental Sustainable City, Hong Kong (invited speaker).
5. Ma, H.-K. (2014.10). E-waste recycling technologies in Taiwan. E-waste treatment technologies and achievement in Taiwan. Building an Eco-friendly Recycling Society, Ho Chi-Minh City, VietNam (invited speaker).