Tim Kelly, Michael Minges, Boutheina Guermazi and Greg Staple. 1999. Direction of Traffic: Trading telecom minutes. Geneva, Switzerland and Washington DC: ITU/TeleGeography.
The third edition of the ITU/TeleGeography Direction of Traffic collaboration.
Tim Kelly, Michael Minges and Gregory Staple. 1996. Direction of Traffic: Trends in international telephone tariffs. Geneva, Switzerland and Washington DC: ITU/TeleGeography.
The second edition of the ITU/TeleGeography collaboration.
Michael Minges, Tim Kelly and Gregory Staple. 1994. Direction of Traffic: International telephone traffic. Geneva, Switzerland and Washington DC: ITU/Telegeography.
Cover drawing by Fei Lap Liu of Hongkong who was 9 years old at the time it was made.