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D.J Spedding. Air pollution. England: Oxford University Press, 1974
E.N. Ramsden. Chemistry and Society for Hong Kong. Hong Kong: Pilot Publishing Company, 1997
REX Heyworth. Chem 2000 (Book 2). Hong Kong: Macmillan Publishers (China) Limited, 1993
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Environmental Protection Department http://www.info.gov.hk/epd/
Kowloon-Canton Railway Corporation http://www.kcrc.com/
MTR Corpration http://www.mtrcorp.com/
MingPao News http://www.mingpaonews.com/
HKiMail http://hk-imail.singtao.com/
http://members.ch.tripodasia.com.hk