"Igloo consolidating operations in Katy facility." Houston Business Journal. Monday October 18, 2004. Retrieved on March 2, 2011. "1001 W. Sam Houston Parkway North" for the old Houston facility
"Master Plan Executive Summary." George Bush Intercontinental Airport Master Plan. Houston Airport System. December 2006. 2-1 (23/130). Retrieved on December 14, 2010.