Reference statistics sampling dates for academic year 2010-2011:
| July 25-July 31, 2011 |
| Aug. 15-21, 2011 |
| Sept. 12-25, 2011 (Gov doc reference statistics also collected) |
| Oct. 10-23, 2011 |
| Jan. 2-8, 2012 |
| Jan. 30-Feb. 12, 2012 (Gov doc reference statistics also collected) |
| Mar. 12-18, 2012 |
| Mar. 26-Apr. 8, 2012 |
| May 14-20, 2012 |
| June 11-17, 2012 |