Lund-Johansen, p. 70, 1974. Oluf Lund-Johansen, World Radio TV Handbook, Cardfont Publishers (under license from Billboard Publications), 1974, 1994, 1997.
Lund-Johansen, p. 81, 1994, volume 48. Oluf Lund-Johansen, World Radio TV Handbook, Cardfont Publishers (under license from Billboard Publications), 1974, 1994, 1997.
Lund-Johansen, p. 88, 1997, volume 51. Oluf Lund-Johansen, World Radio TV Handbook, Cardfont Publishers (under license from Billboard Publications), 1974, 1994, 1997.