^Frommer's Beijing - Page 32 Jen Lin-Liu - 2010 "Ticket booths are below ground, and a ticket costs ¥2 for a ride anywhere with unlimited transfers. The metro card, officially known as the “Municipal Administration and Communication Card” (Shizheng Jiaotong Yikatong, or Yikatong for short..."
^Frommer's Beijing Day by Day, Official U.S.O.C. Edition - Page 149 Jen Lin-Liu, Sherisse Pham - 2007 " The subway card, officially known as the Municipal Administration and Communication Card (Shizheng Jiaotong Yikatong) can be bought for a ¥40 minimum (including ¥20 for deposit)."
^Frommer's China - Page 65 Simon Foster, Candice Lee, Jen Lin-Liu - 2012 The metro card, officially known as the “Municipal Administration and Communication Card” (Shizheng Jiaotong Yikatong, or Yikatong for short) can be bought for a ¥40 minimum, including ¥20 for deposit."
^Smart Spaces and Next Generation Wired/Wireless Networking Page 167 Sergey Balandin, Yevgeni Koucheryavy, Honglin Hu - 2011 "The Oyster card in London[14] and the Yikatong in Beijing[15] are transportation cards based on the MIFARE[16] technology. In Asia, the Octopus Card[17] in Hong Kong is based on the FeliCa standard[18] which is a contactless card ..."
^[unsubstantiated] Misty Littlewood, Mark Littlewood - Gateways to Beijing: a travel guide to Beijing Page 128 2008 YIKATONG (BEIJING SUPER-PASS) — The Yikatong Card (一卡通), also referred to as the Beijing Superpass, is an electronic payment card for use ... The Yikatong serves as a rechargeable, electronic stored value card for cashless payment."
^Chine - Page 176 Michelin / MFPM - 2010 "Bon à savoir – Des cartes de transport prépayées (shizheng jiaotong yikatong) sont en vente dans les stations de métro ..."