"BARB's multichannel top 10 programmes". barb.co.uk. Retrieved January 1, 2012. Note: Information is in the section titled "w/e March 13–19, 1999", listed under Sky 1
denofgeek.com
Sordi, Nina (September 22, 2009). "Top 10 X-Files episodes". Den of Geek. Retrieved December 30, 2011.