• Gift for a Queen - Hanging Gardens of Babylon (2:44) http://youtu.be/Kfg1YE-BqTc
  
• Skyrise Greenery in Singapore (4:03) https://youtu.be/UTgUAE8kylg

• Videos:
  
• - Do Cities Need More Green Roofs? | NPR (3:49) https://youtu.be/FlJoBhLnqko
• Introductory Guide on Greening in Buildings (Buildings Department) http://www.bd.gov.hk/english/documents/pamphlet/IGG_e.pdf
  
• Skyrise Greenery http://www.greening.gov.hk/en/green_technologies/skyrise.html
  
• Hui, S. C. M., 2016. Green roof development in Hong Kong, Hong Kong Engineer, 44 (7). http://www.hkengineer.org.hk/program/home/article.php?aid=8841&volid=193

• 講清講楚 (On the Record - TVB iNews) 2016-05-29 http://news.tvb.com/programmes/ontherecord/574acbb46db28c8e75000000
  
• Hanging Gardens of Babylon http://en.wikipedia.org/wiki/Hanging_Gardens_of_Babylon
  
• Green Roof Research http://ibse.hk/greenroof/
  
• Green Roof - Wikipedia https://en.wikipedia.org/wiki/Green_roof

References:

• Hui, S. C. M., 2011. Technical Guidelines for Green Roofs Systems in Hong Kong, Department of Mechanical Engineering, The University of Hong Kong, Hong Kong. (submitted to CIBSE Hong Kong Branch) http://ibse.hk/greenroof/HK_Green_Roof_Technical_Guidelines.pdf