All credits given to these sources:
Newspaper Articles:
Boh, S. (2015, February 10). Why is littering still a problem in Singapore?. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/why-is-littering-still-a-problem-in-singapore
Chang, R. (2015, February 16). Liak Teng Lit: 5 million people, 70,000 cleaners…that’s ridiculous!. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/liak-teng-lit-5-million-people-70000-cleanersthats-ridiculous
Choo, R. (2015, January 22). S$19,800 fine, CWO for high-rise littering. Today Online. Retrieved from http://www.todayonline.com/singapore/s19800-fine-cwo-high-rise-littering
Feng Z. K. (2015, February 10). Rubbish woes persist, but experts say Singapore’s ‘clean city’ image can be reclaimed. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/rubbish-woes-persist-but-experts-say-singapores-clean-city-image-can-be
Hoe, P. S. (2014, June 8). Woman hit by bike wheel ‘flung from 14th floor’ dies. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/woman-hit-by-bike-wheel-flung-from-14th-floor-dies
Khew, C. (2015, February 10). Current measures against littering in Singapore. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/current-measures-against-littering-in-singapore
Liang, A. (2010, June 18). Blocked drain caused Orchard Road flood. The Straits Times, Retrieved from http://news.asiaone.com/News/AsiaOne+News/Singapore/Story/A1Story20100618-222731.html
NEA steps up enforcement against littering offenders. (2014, April 12). Today Online. Retrieved from http://www.todayonline.com/singapore/nea-steps-enforcement-against-littering-offenders
Ng, A. (2017, March 8). Efforts to stem dirty habit lead to dip in high-rise littering. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/efforts-to-stem-dirty-habit-lead-to-dip-in-high-rise-littering
Revermann, S (n.d.). How does littering affect the environment. Education – Seattle pi, Retrieved from http://education.seattlepi.com/littering-affect-environment-6802.html
Tai, J. C. (2017, February 22). Beach Litter also swept in from offshore. The Straits Times, Retrieved from http://www.straitstimes.com/forum/letters-in-print/beach-litter-also-swept-in-from-offshore
Tan, A. (2014, April 15). Anti-litter blitz at 30 hot spots. Asiaone, Retrieved from http://news.asiaone.com/news/singapore/anti-litter-blitz-30-hot-spots?page=0%2C0
Tan, A. (2015, February 10). What more can be done to keep littering at bay?. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/environment/what-more-can-be-done-to-keep-littering-at-bay
Tan, A. (2017, March 17). Plastic cups found in the gut of sperm whale. The Straits Times, Retrieved from http://www.straitstimes.com/singapore/plastic-cups-found-in-the-gut-of-sperm-whale
Websites:
Andrews, G. (n.d.). Plastics in the Ocean Affecting Human Health. Teach The Earth. Retrieved from http://serc.carleton.edu/NAGTWorkshops/health/case_studies/plastics.html
Cigarette Butt Litter: The Fact. (2015, January). River Keepers. http://www.riverkeepers.org/wp-content/uploads/2016/06/Cigarette_Fact_Sheet_3-1_Jessica.pdf
Journal Articles:
National Environmental Agency. (2011). Towards a Cleaner Singapore: A sociological study on littering in Singapore. Singapore, Singapore: Author. Retrieved from http://www.publichygienecouncil.sg/docs/default-source/default-document-library/towards-a-cleaner-singapore-(final).pdf?sfvrsn=2
Rath, J. M., Rubenstein, R. A., Curry, L. E., Shank, S. E., & Cartwright, J. C. (2012). Cigarette Litter: Smokers’ Attitudes and Behaviors. International Journal of Environmental Research and Public Health, 9(6), 2189–2203. http://doi.org/10.3390/ijerph9062189
Robinson, S. N. (1976). Littering Behavior in Public Places. Environment and Behavior, 8(3), 363-384. doi:10.1177/136327527600800303
Slaughter E, Gersberg RM, Watanabe K, et al. (2011) Toxicity of cigarette butts, and their chemical components, to marine and freshwater fish Tobacco Control; 20: i25-i29
Images:
Asia One. (2012, February 21). Retrieved from http://www.asiaone.com/A1MEDIA/news/02Feb12/images/20120221.091018_cleaner.jpg
Asia One. (2014, March). Retrieved from http://news.asiaone.com/sites/default/files/styles/w400/public/original_images/Mar2014/20140311_nea_nea-logo.jpg?itok=6jL5LZsZ
http://binscorner.com/mails/6/6-ways-to-be-a-wise-person/30074205_images_xlarge.jpeg
https://cdn.pixabay.com/photo/2017/02/11/09/12/family-2057307_960_720.png
http://www.deloupe.com/medias/plein-ecran/equipements/ent-mat-residus.jpg
http://www.ecovisionltd.com/wp-content/uploads/2016/08/2-1920×500.jpg
http://i.imgur.com/rKpPCoc.jpg
http://www.sec.org.sg/earthhelper/images/logo_new.png
https://upload.wikimedia.org/wikipedia/commons/b/b1/Mother_and_baby_sperm_whale.jpg
https://upload.wikimedia.org/wikipedia/commons/f/f5/American_cockroach_8-15-2009.jpg
https://upload.wikimedia.org/wikipedia/commons/2/28/Mosquito-feeding.jpg
National Environmental Agency. http://www.nea.gov.sg/docs/default-source/energy-waste/recycling-labels.jpg?sfvrsn=2
National Environmental Agency. http://www.nea.gov.sg/images/default-source/events-progs/campaigns/cgs-logo-lock-up_29-sep_final.jpg?sfvrsn=0.5495081751093709
Public Hygiene Council. https://www.publichygienecouncil.sg/images/default-source/splash-banner/banner1-1.jpg?sfvrsn=0
The Straits Times. (2017, March 8). Retrieved from http://www.straitstimes.com/sites/default/files/attachments/2017/03/08/ST_20170308_ANLITTER08_2990562.pdf
Today Online. Retrieved from http://www.todayonline.com/sites/default/files/styles/photo_gallery_image_lightbox/public/21757288.JPG?itok=n_g5Bgf4