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(原始内容存档于2021-05-13). The launch of LTC's smart card technology is underway. London Transit Commission. [10 February 2016]. (原始内容存档于2016-02-12). La carte Opus à Lévis
Stations 2010. Metropolitan Transportation Authority. [2013-10-27]. (原始内容存档于2013-02-11). MTA/New York City Transit Subway Line Information - Flushing-Main