[1] Calendar API ( (4/19/2011, 3:20:10 PM 版)) <http://www.w3.org/TR/2011/WD-calendar-api-20110419/>

[2] Calendar API ( (10/2/2012, 11:46:33 AM 版)) <http://dev.w3.org/2009/dap/calendar/>

[3] Calendar API ( (1/10/2014, 1:23:09 PM 版)) <http://www.w3.org/TR/2014/NOTE-calendar-api-20140114/>