1. Rijal Saffuan (2010). Sustainable Green Technology Innovation for Liveable Cities, Paper Presentation, 1st International Young Planners Forum 2010, Kuala Lumpur.
2. Enrique Peñalosa Londono (2001). Park for Liveable Cities: Lesson from a Radical Mayor, Keynote Address, Urban Parks Institute's “Great Parks/Great Cities” Conference, New York.
3. http://en.wikipedia.org/wiki/World%27s_most_livable_cities. Search on 25 August 2010.
4. http://en.wikipedia.org/wiki/Zero-energy_building. Search on 25 August 2010.