FEI rules
www.fei.org/Disciplines/Dressage/Pages/Rules.aspx
The updated rule book (23rd edition, valid from 1 January 2009)
www.fei.org/Disciplines/Dressage/Documents/Final_Dre_Rules-2009-black%20formatted.pdf
Guidelines for Judges for FEI Freestyle Tests (valid from 2 May 2005)
www.fei.org/Disciplines/Dressage/Documents/Guidelines for Freestyle.pdf