International telecommunication union. (1973). Twelth report by the International telecommunication union on telecommunication and the peaceful uses of outer space. Geneva: International telecommunication union.
Dyfyniad Arddull ChicagoInternational telecommunication union. Twelth Report By the International Telecommunication Union On Telecommunication and the Peaceful Uses of Outer Space. Geneva: International telecommunication union, 1973.
Dyfyniad MLAInternational telecommunication union. Twelth Report By the International Telecommunication Union On Telecommunication and the Peaceful Uses of Outer Space. Geneva: International telecommunication union, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.