المؤلفون: Rosa, Lluis la, Rovira, Mercè, Beer, Martin, Montaner, Miquel, Gibovic, Denisa

المصدر: Citizens and E-Government : Evaluating Policy and Management. 2010, p131-156.

المؤلفون: Crowther, Paul, Beer, Martin

المصدر: Encyclopedia of Mobile Computing and Commerce. 2007, v. 2, p528-532.