"Research into the rates of listening and the attitude of the public towards radio in some developing countries of Africa — The difficulties of carrying out such research — lack of basic statistics — The multiplicity of languages - Difficulties of various kinds." (Jean-Marie Van Bol, Abdelfatt ... ah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 290, topic code 262) more