- [1] ''Aural style sheets'' <http://www.w3.org/TR/REC-CSS2/aural#propdef-pitch>

[2] [CITE[Styling – SVG 1.1 (Second Edition)]]
( ([TIME[2011-08-10 12:35:27 +09:00]] 版))
<http://www.w3.org/TR/2011/REC-SVG11-20110816/styling.html#AuralStyleSheets>