Coba jelasin Lihat pula dari Kartu Octopus dong

Mondex, Visa Cash dan Mon€o

Octopus wins on cash card usage; MasterCard, Visa give up on Hong Kong Market, Hong Kong iMail, 1 February 2002.

Connecting fare systems in Guangzhou, Shenzhen and Hong Kong. Nanfang Daily, 19 January 2005. (News report in Chinese). Retrieved 1 February 2004.

Extending Octopus to Shenzhen . Hong Kong Commercial Daily, 8 November 2003. (News report in Chinese). Retrieved 1 February 2004.

Cash cards rule, change is passé in Hong Kong . Dan Gillmor, Mercury News, 24 November 2002.