Ritu Agarwal Massimo Magni Corey M. Angst A Multilevel Investigation of Normative and Informational Influences on Extensiveness of Individual Technology Use. 23 2007 ICIS http://aisel.aisnet.org/icis2007/23 conf/icis/2007 db/conf/icis/icis2007.html#AgarwalMA07