Brooks, D. M. 2003. The role of size assortment in structuring Neotropical bird communities. Tex. J. Sci. 55: 59–74
Carolyn. (2012). Group aims to boost green office practices. The Staits Times. Retrieved February 25, 2012, from http://www.newpropertyforsale.sg/news/2012/group-aims-boost-green-office-practices/
Chawla, L. (2002). Spots of Time: Manifold ways of being in nature in childhood. In Kahn, P. and Kellert, S. (Eds) (2002) Children and Nature. Cambridge: MIT Press.
Clayton, S., & Opotow, S. (2003, Eds.) Identity and the natural environment: The psychological significance of nature. Cambridge, MA: MIT Press.
Eco Business. (2012). Price water the Singapore way to curb waste: UN. The Straits Times. Retrieved March 18, 2012, from http://www.eco-business.com/news/price-water-the-singapore-way-to-curb-waste-un/
Gleick, P.H., ed. (1993). Water in Crisis: A Guide to the World’s Freshwater Resources. Oxford University Press. p. 13, Table 2.1 “Water reserves on the earth”.
Herr. (1991). Effects of Word-of-Mouth and Product- Attribute Information on Persuasion: An Accessibility-Diagnosticity Perspective. Journal of Consumer Research, 17(10), 98-104
Hg Tech. (2012). Shark’s Fin Soup. Mercury Technology Services. Retrieved March 28, 2012, from http://www.hgtech.com/Information/Shark_Fin_Soup.html
Hirsh & Dolderman. (2007). Personality predictors of Consumerism and Environmentalism: A preliminary study. Journal of personality and Individual Differences, 43(1), 583–1593
IUCN. (2012). The IUCN Red List of Threatened Species. Red List. Retrieved March 22, 2012, from http://www.iucnredlist.org/apps/redlist/details/12763/0
Jessica Cheam. (2012). NCCS. Retrieved March 20, 2012, from http://app.nccs.gov.sg/news_details.aspx?nid=584&pageid=98
Joyce Wong. (2001). The Impact of Viewing a Garden on Physiological Health of Elderly Women. NLC. Retrieved March 3, 2012, from http://www.nlc-bnc.ca/obj/s4/f2/dsk3/ftp04/MQ61959.pdf
Nanayakara. (2012). Gardens help foster kampung spirit. Asiaone. Retrieved April 2, 2012, from http://www.asiaone.com/News/Latest%2BNews/Singapore/Story/A1Story20120402-337081.html
Noam Mohr. (2005). A New Global Warming Strategy. An Earthsave International Report. Retrieved March 18, 2012, from http://www.earthsave.org/news/earthsave_global_warming_report.pdf
PETA. (2012). Fight Global Warming by Going Vegetarian. Retrieved March 19, 2012, from http://www.peta.org/issues/animals-used-for-food/global-warming.aspx
PUB. (2011). What are the key benefits of using NEWater? NEWater used in Industries and Commercial buildings. Retrieved March 18, 2012, from http://www.pub.gov.sg/E-Services/NEWater/Pages/NEWaterUsedinIndustrialandCommercial.aspx
Ria Tan. (2012). Shangri-La stops selling shark’s fin. Wild Singapore. Retrieved March 23, 2012, from http://wildsingaporenews.blogspot.com/2012/01/shangri-la-stops-selling-sharks-fin.html
Science Daily. (2007). Pollution Causes 40 Percent Of Deaths Worldwide, Study Finds. Science News. Retrieved March 17, 2012, from http://www.sciencedaily.com/releases/2007/08/070813162438.htm
Smith. (2010). Butterflies, Bees Most Important To Ecosystem Survival. Greenopolis. Retrieved March 28, 2012, from http://greenopolis.com/goblog/litegreen/importance-being-butterfly
Tan. (2012). Tax to be based on carbon emission. The Straits Times Retrieved February 26, 2012, from http://app.nccs.gov.sg/news_details.aspx?nid=605&pageid=98
Tan, H. et al., 2008. Checklists of Threatened species: Plants. In, Davison, G., Ng, P. & Ho, H. 2008. The Singapore Red Data Book: Threatened Plants and Animals of Singapore. 2nd edition, Nature Society, Singapore.
WWF. (2009). Mediterranean bluefin tuna stocks collapsing now as fishing season opens. WWF Global. Retrieved March 20, 2012, from http://wwf.panda.org/?162001/Mediterranean-bluefin-tuna-stocks-collapsing-now-as-fishing-season-opens