US patent 2742525, Norbert D. Larky, Somerville & David I. Holmes, New Brunswick, N.J., "Color Test Pattern Generator", issued April 27, 1956, assigned to Radio Corporation of America
Goldberg, A. A. (June 30, 1977). "A Monitor Alignment Color Bar Test Signal"(PDF). Proceedings, 31st Annual Broadcast Engineering Conference, National Association of Broadcasters. 31: 84–85.