1. Bernard, J.; Harrad, K. et al.: Advertising expenditure forecast. Zenith Media, London (UK) 1998.
2. European Information Technology Observatory. European Information Technology Observator y (EITO) — European Economic Interest Grouping (EEIG), Frankfurt/Main 1998.
3. People, paper and the future of print (Human factors final report). Sorkin-Enenstein Research Service, Chicago (IL) 1996. Printing Industries of America (PIA) — exclusively for GAMIS members, Alexandria (VA) 1996.
4. Printers and the Internet. Graphic Arts Marketing Information Service (GAMIS), Alexandria (VA) 1998.
5. Robinson, J.P.R.; Godbey, G.: Time for life: The surprising ways Americans use their time. Pennsylvania State University Press, University Park (PA), 1997.