World radio TV handbook 1995
Telecommunications research resources : an annotated guide / James K. Bracken, Christopher H. Sterling
Guia de viagem do executivo / Mark H. McCormack; trad. Maria Isabel Barros P. Veríssimo
The manual of tariffing for specific market segments / Chorleywood Consulting Ltd.
Traveler's guide to world radio / ed. Andy Sennitt