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Press release on Nokia Octo-phone . From Octopus cards homepage. Retrieved 1 February 2004.

Special limited edition 2004 Octopus card . From Octopus cards homepage. Retrieved 1 February 2004.

Architecture of the "central clearing house system" . From Octopus cards homepage. Retrieved 1 February 2004.

NTT DoCoMo and Sony team up on contactless smart cards for mobile phones Computer Weekly, 28 October 2003. Retrieved 1 February 2004.

ERG Group FY2004 annual report . Retrieved 1 February 2004.

Granting of authorisation to Creative Star Limited as a deposit-taking company Hong Kong Monetary Authority press release, 25 April 2000. Retrieved 1 February 2004.

Mondex press release citing failure in Hong Kong . (Chinese only). Retrieved 1 February 2004.

Modern Computer press release on cooperation with MTR  From the homepage of Shenzhen Modern Computer, the provider of automatic fare collection systems to Shenzhen Metro. Retrieved 1 February 2004.

Where to focus RFID privacy concerns . By Peter Winer, Big Chief Partners, Inc. Retrieved 1 February 2004.

Question on Octopus card reserve fares. From the homepage of the Legislative Council of Hong Kong, 21 May 2003. Retrieved 1 February 2004.

Case study from the RFID Knowledgebase. Retrieved 1 February 2004.