[1] Prince: Download Alpha 2007-04-13 (4/15/2007, 6:39:43 AM 版) <http://princexml.com/alpha/2007-04-13/>
[2] AH Formatter Float Extension ( (5/23/2013, 12:11:04 AM 版)) <http://antennahouse.com/CSSInfo/float-extension.html#FootnoteCSS>
Google search: footnote-call