*David A. Hatch with Robert Louis Benson, [http://www.nsa.gov/publications/publi00022.cfm The Korean War: The SIGINT Background], National Cryptographical Museum, 2001
*David A. Hatch with Robert Louis Benson, [http://www.nsa.gov/publications/publi00022.cfm The Korean War: The SIGINT Background], National Cryptographical Museum, 2001