“2011 Rules - American Le Mans Series”. International Motor Sports Association. p. 39, Standing Supplementary Regulations, Section 1, Part 2. October 3, 2011時点のオリジナルよりアーカイブ。April 18, 2011閲覧。
“2011 Rules - American Le Mans Series”. International Motor Sports Association. p. 39, Standing Supplementary Regulations, Section 1, Part 2. October 3, 2011時点のオリジナルよりアーカイブ。April 18, 2011閲覧。