Worldwide Videotex. (1981). Worldwide videotex update. Worldwide Videotex.
Cita Chicago Style (17a ed.)Worldwide Videotex. Worldwide Videotex Update. Boston, MA: Worldwide Videotex, 1981.
Cita MLA (9a ed.)Worldwide Videotex. Worldwide Videotex Update. Worldwide Videotex, 1981.
Precaución: Estas citas no son 100% exactas.
