[1] [CITE@en[CSS Counter Styles Level 3]]
( ([TIME[2013-07-19 04:03:09 +09:00]] 版))
<http://www.w3.org/TR/2013/WD-css-counter-styles-3-20130718/>

[2] [CITE@en[Predefined Counter Styles]]
( ([TIME[2013-06-06 03:13:21 +09:00]] 版))
<http://www.w3.org/International/docs/counter-styles/Overview.html>

[3] [CITE@en[Predefined Counter Styles]]
( ([TIME[2013-07-24 14:49:19 +09:00]] 版))
<http://www.w3.org/TR/2013/WD-predefined-counter-styles-20130725/>