[1] CSS Print Profile ( (2013-03-14 20:50:03 +09:00 版)) <http://www.w3.org/TR/2013/NOTE-css-print-20130314/#section-properties>

[2] CSS Print Profile ( (2013-03-14 20:50:03 +09:00 版)) <http://www.w3.org/TR/2013/NOTE-css-print-20130314/#section-images>

[3] CSS Print Profile ( (2006-10-13 22:15:05 +09:00 版)) <http://www.w3.org/TR/2006/WD-css-print-20061013/#section-properties>