"This study deals with the communication media and the attitude of the public in Puerto-Rico — Which of the communication media (printed press, radio T.V.) is the most popular and the most utilised by the public? — What makes a particular category of people prefer one medium to another — The preference for one medium in relation to certain factors: age, education, income — Results of the study — Conclusions." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 795, topic code 04, 173, 263, 453)